Air Conditioning Repair Troubleshooting Guide

Air Conditioning Repair Troubleshooting Tips

Air Conditioning Repair

Your air conditioning system is the key to keeping your home comfortable and cool, especially during the heat of the summer. When an AC unit stops functioning it is a crisis that you want to address as soon as possible, but the high demands of the intense summer months can mean that a repair technician appointment can be days or even a week away.

There are a few different troubleshooting tips that you can use to diagnose your air conditioning repair on your own. The following guide provides general highlights and a few common solutions to get your air conditioning system up and running to its full potential as quickly as possible.

Air Conditioning Repair Troubleshooting Tips

Ensure Proper Thermostat Setting

Confirming that your thermostat is set properly can sometimes resolve your air conditioner troubles. Improper settings can cause your HVAC unit to not work as desired. Your thermostat could be accidentally adjusted to heat instead of cool, or the temperature setting can be jostled. If undetected, it can cause your AC system to push out warm air instead of the refreshing cool air desired. Before you call an air conditioning repair technician, be sure to check your thermostat.

Check Your Thermostat Batteries

If your thermostat is set properly, make sure that the batteries are still functioning. If you are unsure of their life-space, replace them with fresh batteries to rule out a low battery issue. Without functioning batteries, the thermostat cannot communicate with the air conditioning unit.

Replace Your Air Filter

Proper airflow is crucial to a fully functioning air conditioner. An HVAC filter that is clogged with dust and debris will restrict airflow and increase the strain on your AC system. The newer and more modern that air conditioning system, the more sensitive the unit will be to a dirty AC filter. If you cannot remember the last time your filter was changed, it is time to change the filter. We strongly recommend writing the date of installation on the filter to keep accurate records of the replacement date of the filter.

Check the Circuit Breaker and Electrical Components

Checking to make sure that the power supply to your air conditioning unit is in good shape sounds elementary, but a tripped breaker or a switched flipped to the “off” position can be an easy and quick fix to HVAC system failures.

Inspect Your Air Vents

Keeping your air vents and air returns clear and unobstructed is an important step in ensuring your air conditioning unit is properly functioning. Dust, debris, or furniture can block air vents and can impede airflow and increase the strain on your air conditioning system. There can also be a variety of obstructions that are inside of your air conditioner ductwork such as mold, crushed ductwork, vermin infestation, or insulation blockages.

How to Know When You Need to Call for Air Conditioning Repair

Air Conditioning Repair Troubleshooting TipsWe have discussed a few tips to diagnose a poorly functioning air conditioner. Although there are DIY techniques that you can do yourself to improve air conditioner function, there are several situations that require an air conditioning repair professional. Here are just a few that require an immediate call so we can quickly repair your air conditioning system.

Unusual Noise of Any Type Coming from Your HVAC System

Loud banging, vibrations, or metal sounds of any type are an urgent sign to call in the professionals. These sounds are an indication of a serious problem. The chances of this being an easy fix that you can do on your own are highly unlikely.

Any Issue with the Outdoor Unit

You should never attempt to repair the outdoor component of your HVAC unit. Improperly attempting to repair your outdoor AC component can result in costly repairs by our professional technicians.

Improper AC Installation

An AC installation that was not properly configured can be the cause of a poorly function air conditioning system. If the HVAC system is too small for the size of the home, or the ductwork is improperly designed, it can lead to an air conditioner that needs constant repair and servicing.

For more information about R.M. Mullinix or Air Conditioning Repair, schedule an appointment, or visit our air conditioning repair information page.

Air Conditioning Repair: How to Extend the Life of Your AC System

Air Conditioning Repair: How to Extend the Life of Your AC System

Parts of the Central Air Unit That Needs a Regular Air Conditioning Repair

Your Central Air system is mechanical and made of many different components. As they operate and wear on each other, they are bound to stop functioning or wear out. Chances are these parts that will fail at the most inopportune time and require a central air conditioning repair call. Below are parts of the air conditioning unit that needs a regular air conditioning service:

Evaporator Coil

Your central air conditioning system evaporator coil may not come in direct contact with dust and debris, but it still can get dirty. The coil must be cleaned if the dust and dirt accumulate. As the evaporator coil becomes dirty its efficiency decreases. The evaporator coil should be cleaned at least once a month.

Central Air Conditioning Filter

Your HVAC filter does exactly what the name says, it filters. It will filter dust, debris, allergens, bacteria, and some viruses out of your home’s indoor air. If the filter is too dirty, its efficiency decreases, which means that more pollutants stay within your home.

Drainpipes and Drip Pans

Your drain pan and the drainpipes for your central air conditioning unit must work properly for the system to function properly. Keep the drainpipe and drip pan clean and free of any debris that may clog any moisture that accumulates to cause a blockage.


The reaction between the compressor oil and moisture inside your central air conditioning unit creates a corrosive substance. A buildup of this substance can damage the condenser. A chemical cleaning by one of our central air technicians can be done to remove the corrosive acids. Due to the acidic nature of this chemical reaction, components will eventually have to be replaced.

Determining if You Need Central Air Conditioning Repair

Parts of the Central Air Unit That Needs a Regular Air Conditioning RepairYour central air system is crucial in maintaining comfort throughout your home. Without a properly functioning central AC system, not only can your home become uncomfortable, it can cause appliances to overheat, and cause other systems to work harder.

The heat of summer and inconsistent maintenance can put your central air conditioning system at risk. Do not prolong your central air conditioning repair and maintenance, call our technicians today to save money on costly repairs.

If you have noticed a decrease in the efficiency of your AC system, call us today to schedule a central air conditioning repair appointment.

For more information about R.M. Mullinix or indoor air quality, schedule an appointment, or visit our air conditioning repair information page.

6 Facts About Indoor Air Quality—And How to Improve It

6 Facts About Indoor Air Quality

Indoor Air Quality Facts To Improve Your Health

EPA research has proven that the air inside your home contains five to ten times more pollutants than the outside air. Poor air quality is one of the most common irritants for allergies, asthma, and chronic respiratory infections. In addition to the physical aspects of poor indoor air quality, bad indoor air quality can also cause emotional issues like poor mood and temperament.

We take a fresh breath of clean air for granted. Fresh air renews and invigorates our bodies and removes toxins from our blood.

6 Facts About Indoor Air Quality—And How to Improve ItThe Facts About Indoor Air Quality

Ninety percent of our time is spent indoors. Keeping the air inside our home should be a top priority. The following statistics are quite disturbing, but it will help you understand why it is important to keep the air inside your home clean.

  • A 2000 square foot home has approximately 53 pounds of dust polluting the air. That equates to about 850 ounces of dust and debris.
  • In each ounce of dust, approximately 42,000 dust mites can be found. That means the average 2,000 square foot home has 35 million dust mites inflaming your allergies, making it difficult to breathe, and causing fatigue.
  • Dust mites drop fecal matter about 20 times per day. That equates to 712 million dust mite pellets per day dropped in a home.
  • You will lose about ¾ of a pound of dead skin per day. That dead skin finds its way into your HVAC ductwork.
  • A couple will leave about 12 pounds of dead skin in their mattress each year.
  • Harvard research shows that homes tested for indoor air pollutants, 100% had one or more air quality problems.
  • 5 million Americans have been diagnosed with asthma or allergies. Those are cases that are diagnosed, there are many additional asthma and allergy sufferers that are never diagnosed.

Without any of these statistics, it is a great idea to be proactive and protect your indoor air quality as best you can. This is especially true when it comes to the Texas Gulf Coast. The Houston Metro Area is surrounded by industry and manufacturing known to contaminate our air quality.

For the same reason you would not drink standing water in a mud puddle, you don’t want to breathe in polluted air.

For more information about R.M. Mullinix or indoor air quality, schedule an appointment, or visit our indoor air quality information page.



FAQs: Your HVAC System and the Covid-19 Coronavirus

FAQs: Your HVAC System and the Covid-19 Coronavirus

Maintaining Indoor Air Quality During the Covid-19 Pandemic

We have had non-stop questions about how your air conditioning system operation and maintenance needs to change during the Covid-19 pandemic. Here is the most up-to-date and accurate information that we have available to assist in making decisions for the health and safety of your home.

The Covid-19 virus emerged very quickly. It spread worldwide in a matter of a few months. There has not been a great deal of scientific data accumulated to conduct thorough studies to publish quantified results.  There has yet to be any evidence that the virus can be transmitted through an HVAC system. Most of the protocol and preventative measures are being based on similar viruses.

The Covid-19 information that we are sharing is based on that information.

Good News First! There has not been any confirmed proof that Covid-19 has been transmitted through the ductwork of an air conditioning system. As far as we know, this virus is primarily transmitted by direct contact with an infected person and by touching a contaminated surface.

Airborne Transmission

According to the experts, airborne transmission of Covid-19 is possible in theory. Respiratory droplets can keep virus particles airborne for hours. If this is possible, they could enter the air ventilation system. HOWEVER, scientists believe that Covid-19 transmission through this manner is negligible.

Mitigation Procedures

Covid-19 Mitigation tactics are helpful in reducing the possibility of your air conditioning system being contaminated with Covid-19. Reducing the potential exposure through mitigation must be part of a comprehensive plan to reduce person-to-person contact and contaminated surface contact.

FAQs: Answers to Your Specific Questions from Our Phone Lines

Can Covid-19 be transmitted through HVAC ductwork?

Maintaining Indoor Air Quality During the Covid-19 PandemicThere has yet to be a scientific conclusion that the virus can be spread through air ventilation systems. There are many ideas currently circulation that you can add to mitigation procedures to reduce the potential spread of all pollutants within your home’s air conditioning system. HEPA high-efficiency filters are very capable of removing airborne viruses, bacteria, and other airborne debris from your home to promote improved indoor air quality.

The installation of a UV-C light technology or ionization-based air purification system will destroy airborne viruses and other pollutants. Increasing the humidity and airflow can deactivate and dilute airborne pollutants. Having routine maintenance on your air conditioning system that sanitizes your HVAC system components is extremely beneficial.

Are HEPA high-efficiency filters effective against the spread of Covid-19?

HEPA air filters can remove small particles, as small as viruses, from your airflow within your home. Although using a HEPA air filter can reduce Covid-19 transmission, it will not completely eliminate the risk. The Covid-19 virus is so small it has the potential to pass through some HEPA filters.

The downfalls of using high-efficiency filters are that they can restrict airflow due to their denseness and your HVAC system will run longer or more frequently. These HEPA filters do trap more debris, which also means that they will need to be changed more often, and with a cost that is many times double a regular filter, that can be expensive.

According to the National Air Filtration Association (NAFA): “In order for filters to have any impact on infectious disease transmission, the transmission has to occur through the airborne route, filters have to be properly installed and maintained in appropriate systems to treat recirculated air, and filters have to be appropriately designed for the building in which they are used. More importantly, in most buildings and in most situations, filters may be considerably less effective than other infection control measures including social distancing, isolation of known cases, and hand-washing.”

Will UV technology kill the COVID-19 virus?

UV-C light is used to kill and deactivate antigens, including viruses that can pass through filters and penetrate into your HVAC system. There are different types, including upper air and surface-cleaning UV disinfection systems.

According to ASHRAE (as reported in ACHRnews): “the germicidal wavelength can kill 90 percent of all microorganisms living on HVAC air ducts and evaporator coils, depending on wavelength intensity and length of exposure.”

It is important to note that although UV-C light technology has been successful in killing other strains of coronaviruses, it has not been proven to kill Covid-19. UV-C light systems can be expensive, so you will need to weigh the cost toward a benefit that may not be guaranteed.

Are Ionizers effective against Covid-19?

Indoor air filtration systems that use ionized hydrogen peroxide to remove HVAC system pollutants can be placed inside your air distribution system. These small units that can be placed just past the filters destroy pollutants that get through the filters.

How do humidity and ventilation affect COVID-19?

Preliminary research shows that increased indoor humidity can deactivate Covid-19. In winter months where ventilation is reduced and humidity can be between 20-40%, Covid-19 seems to thrive and live for longer periods of time. The increase of moisture in the air may damage the outer membrane of Covid-19 and reduce the likelihood of the virus to remain airborne.

ASHRAE (American Society of Heating, Refrigerating, and Air-Conditioning Engineers) also recommends increasing ventilation (adding more outside air) to dilute any particles that may be present. Here in New York City, that’s not always easily done if you can’t just open a window. However, there are HVAC solutions that can add more outside air to your space.

Should my air conditioning system be sanitized?

This is a practice for most comprehensive maintenance services that are recommended in the spring before your HVAC system enters in the summer rush of its use. Although we cannot guarantee that Covid-19 particles have remained, there is a benefit to clean condenser coils, your ductwork, and your system components. Cleaning your system makes it operate more efficiently, consume less power, and keeps parts in good condition.

Sanitizing your HVAC system components is a one-time event with no long term protection or to future exposure to Covid-19.


For more information about R.M. Mullinix or indoor air quality, schedule an appointment, or visit our indoor air quality information page.

Common Causes of Commercial HVAC Failure


If your business relies on an HVAC system for operation, comfort and/or quality control, then it is extremely important that it is operating at full capacity at all times. There are several things that can go wrong in an HVAC system that can hinder production and productivity, and knowing them can help prevent these downfalls from occurring. Take a look at this list of common commercial HVAC issues so you can learn what might be happening with your system, and then contact an expert commercial HVAC technician to have the issue corrected. Remember, the longer you wait, the worse the problem will get.

Blown Fuse

The fuse is designed to keep the HVAC motor from overheating. If the motor is no longer running in the AC, ventilation or heating system, the first thing a technician will often check is the breaker switch.

Burnt Out Capacitor

There is a run capacitor and a start capacitor in many systems. The start capacitor allows the system to get going by providing an extra boost, and the capacitor is what allows the motor to run at a constant speed. If either of these burns out they will need to be replaced for the system to work correctly.

Clogged Drain Lines

If any drain lines become clogged the drain pan will fill up, resulting in a water leak that could cause water damage.

Thermostat Problem

The thermostat is what tells the system what to do in regard to temperature control. It is important that the thermostat is on and set correctly to ensure the HVAC system can operate as designed.

Seized Compressor

The compressor is the brain of the AC unit. If it is under or overcharged with refrigerant it may overheat or run sluggishly.

Refrigerant Leak

If the system develops a refrigerant leak it will need to be repaired immediately. Depending on where the leak is certain parts, such as the condenser or evaporator coil, may need to be replaced.

If you’re experiencing issues with your commercial HVAC system don’t let it cause your production to hit the floor. For superior commercial HVAC repair in Bryan or College Station, TX, contact R.M. Mullinix AC & Heating. We provide quality service and repair for residential and commercial HVAC systems. To request a quote for commercial HVAC service in Bryan contact us at 979-822-4079 and we’d be happy to help!

Is it Time for Residential Furnace Repair?


Your furnace is responsible for providing heat to your home. If it begins to have trouble you may find yourself piling on the blankets in order to stay comfortable. However, there are several other signs you may experience should it be time to call in an HVAC repair specialist. If you notice any of these symptoms of trouble then you will want to schedule an appointment for furnace repair, maintenance or replacement.

Skyrocketing heating bills

If your gas or electric bill, depending on which type of heating system your home operates, is reaching astronomical numbers it could be because the furnace is malfunctioning. Be sure to call in a HVAC specialist to have the system inspected for any problems.

Turning up the thermostat doesn’t change the temperature

Perhaps one of the more obvious signs that something is amiss is if cranking up the thermostat doesn’t result in a more comfortable home. You should be able to notice a difference in temperature within minutes of turning on a properly working heating system.

Strange sounds from the furnace

No, your furnace isn’t haunted, it just needs repair. If you notice banging, whining or groaning sounds coming from the furnace there is a good chance that a belt needs to replaced or an ignition problem needs correcting.

Reduced air quality

An ill-operating furnace may reduce the air quality in your home by spreading mold, dust and other airborne irritants throughout the house.

Window condensation

While condensation on your windows could be caused by any number of issues there is a possibility it is due to a poorly operating furnace. Give an HVAC expert a call to make sure everything is operating as it should.

End of the furnace’s lifespan

Most furnaces have a lifespan between 10 and 20 years. If your current furnace is anywhere in between that it may be best to replace it to prevent problems later on.

To schedule an appointment for quality furnace repair in Bryan, TX, or the neighboring communities be sure to contact R.M. Mullinix. Our expert technicians offer quality heating and air conditioning repair for homes and commercial spaces. Give us a call at 979-822-4079 to request an estimate for HVAC service in Bryan or College Station today.

4 Steps for Proper Air Conditioning Repair


If your AC system bites the dust you’re going to be left sweating in the insufferable heat. You rely on your air conditioner to drop the temps inside your home or office in order to live comfortably. While air conditioning systems do not utilize many moving parts they do require occasional maintenance and after years of use may be in need of a repair. In order to ensure that you’re getting the highest quality air conditioning repair be sure that the technician you hire will provide a well-rounded checkup of the entire system and not just complete what may only be a temporary fix. Here is how proper AC repair should be conducted.

Properly identify current problems

The first step the technician should take is to listen to your verbal complaints about what is happening with your AC system. They should take note of strange noises, smells and other signs of what the problem may be, as this will help to quickly ID the issue. After an initial conversation the technician should have a solid idea of what is going on and be able to dive into the system to complete further diagnostics.

Replacing the necessary parts

Once the issue is identified the technician should be able to quickly replace the necessary parts to get the air conditioner back up and running. The technician should carry an array of parts in their work vehicle in order to provide timely repairs without having to make multiple trips to your home.

Overlooking the rest of the system

Prior to or in the midst of repairing the system the technician should inspect the rest of the AC unit for any potential issues. This will prevent problems from arising in the near future, ensuring a cool and comfortable summer.

Conducting necessary AC maintenance

If it is found that your AC system requires routine maintenance, such as replacing a filter, the technician should inform you of this now. With your OK they should conduct the necessary services.

Provide tips to increase efficiency

Once your AC unit is fully functional once again the technician may provide you with tips to increase the efficiency of your current system. The technician’s goal should be to help you maximize efficiency while reducing your monthly energy bills.

If you are in need of AC repair find an HVAC company that cares about your long-term comfort. For quality AC repair in Bryan, TX, or the neighboring towns contact R.M. Mullinix. We specialize in residential and commercial HVAC services that will ensure your home or office retains a comfortable climate all year long while maintaining maximum efficiency. To learn more about our Bryan HVAC company or to request a quote for service give us a call at 979-822-4079 today.

6 Signs Your Furnace Needs Repair

6 Signs Your Furnace Needs Repair

As fall and winter approaches you’ll likely be firing up your heating system for the first time in months. As you get it going it is important to pay attention to how it acts, as it may provide you with some signs that it needs repair. If you encounter any of the following issues you will want to contact a professional HVAC company as soon as possible to ensure that you don’t go without heat this fall and winter.


If the inside of your home’s windows are coated with condensation there is a good chance you’re suffering from some sort of heating system malfunction.


If you feel cool drafts in a particular area of your home it is likely because the furnace is no longer heating the whole house. This may be resolved by something as simple as cleaning vents, but it could be a sign of a larger problem. An HVAC expert will be able to perform diagnostics and repair the issue.

Furnace Takes a Long Time to Warm Up

If you’re waiting and waiting for the heat to turn on there may be an issue with the pilot light, thermostat or fan motor.

Yellow Pilot Light

A yellow colored pilot light indicates a poor gas combination in your furnace and may mean there carbon monoxide is present. A pilot light that has the correct gas mixture should be burning a blue color.

High Electric Bills

If your electric bills seem to be getting higher throughout the cooler seasons because you keep on cranking the heater up there is obviously some sort of inefficiency issue that needs to be addressed by a professional heating technician.

Unusual Sounds

If your furnace sounds like it’s crying for help, it probably is. The creaking, banging and whining noises are a sure sign of trouble ahead. The sooner you call someone to take a look the better, as these noises usually indicate a loose belt or ignition problem.

Don’t wait until it’s too late to fix your furnace! If you need furnace service or furnace repair in College Station or Bryan, TX, contact R.M. Mullinix. Our residential heating experts will ensure that you and your family are comfortable all fall and winter. To learn more, or to request an estimate for residential HVAC repair in Bryan or College Station give us a call at 979-822-4079 and we’d be happy to assist you.

Benefits of Annual Residential Heating Maintenance


benefits-of-annual-residential-heating-maintenanceAs a homeowner it is your duty to keep all aspects of your home in proper working condition. This includes maintaining everything from the dishwasher and lighting fixtures to the roof and furnace.The latter, along with the rest of your home’s HVAC system, is critical for a number of reasons. Putting off heating maintenance can result in a number of problems for you and your family, particularly concerning your comfort and your checkbook. As the cooler months approach, it’s important to ensure your home’s heating system is serviced to prevent it from letting you down this winter.

What is heating maintenance?

Routine maintenance of the heating system is often done on an annual basis. Common aspects of furnace maintenance include, but is not limited to, oiling any moving parts of the furnace, ensuring that the pilot light is ignited, checking belts for wear, replacing the filter and addressing any strange noises that may be occurring. Additionally, you may want to consider vent cleaning, to promote clear passage of the heated air, for maximum efficiency.

Why conduct heating maintenance?

Because there aren’t many, if any, moving parts in a heating system, it may seem like a furnace and other HVAC components shouldn’t need maintenance, as a car might. However, without maintenance you could run into a number of issues. Here’s why HVAC maintenance is so critical.

  • Prevent HVAC Breakdowns – HVAC maintenance gives a technician a chance to replace parts before they fail. This prevents downtown and preventative maintenance is always less expensive than completing repairs.
  • Stay Comfortable – A well cared for heating system will help you stay warmer in the winter. Maintenance ensures your system operates at maximum efficiency.
  • Lower HVAC Bills – With routine maintenance your HVAC system will cost you less to operate on a monthly and annual basis. This is because it will operate more efficiently and will be much less likely to require expensive repairs.

As we enter the cooler seasons be sure to conduct routine maintenance of your heating system. If you need residential heating maintenance in Bryan or College Station reach out to the team at RM Mullinix. Our residential heating technicians provide full service heating and cooling services, including maintenance and repair. To learn more about our services or to request a quote from an expert residential HVAC technician in College Station or Bryan or the surrounding areas give us a call at 979-822-4079 today.

3 Financial Benefits of Upgrading a Commercial HVAC System

3 Financial Benefits of Upgrading a Commercial HVAC System

3 Financial Benefits of Upgrading a Commercial HVAC SystemAs a business owner you are no doubt constantly looking for ways to increase the bottom line. One method of doing this is to invest in an upgraded HVAC system in your commercial or industrial facility. An older system can wreak havoc on productivity and cause ugly increases in energy bills as it continues to age. Upgrading an HVAC system can take anywhere from a few days for a smaller operation to a couple weeks for larger facilities, but the end result will have you saving on your monthly and annual expenses, as well as provide several other benefits. If you’re looking for ways to make your building and your bottom line more green, consider these excellent benefits of upgrading your HVAC system.

Increased Productivity

A HVAC system that does not provide fresh, properly tempered air for workers in a factory, industrial plant or other commercial building can lead to decreased productivity because of the less than favorable working conditions. By installing a high quality, new HVAC system you can keep your employees comfortable which will no doubt increase productivity, thus resulting in a larger sales figure at the end of the day.

Reduced Energy Bill

For many people, one of the top reasons to consider a new or upgraded HVAC system for their commercial building is because of the opportunity it presents to drastically decrease their energy bill. Aside from new mechanicals, an upgraded system will allow for proper insulation and air duct sealing, which will reduce a building’s cooling and heating needs. This helps the HVAC system operate at its most efficient capacity, which translates into major energy savings and reduced costs.

Potential Tax Credits/Breaks

There may be tax breaks or credits available through local, state or federal programs for business owners who want to install new HVAC systems that help reduce their carbon footprint. Not only will your business benefit from the upgrade, but it is actually a great way to protect your local community and the environment as a whole. Be sure to ask about these potential incentives as you consider your next HVAC upgrade.

The savings that you will see after upgrading your HVAC system will last for years and years. If you’re interested in commercial HVAC upgrades in Bryan or College Station, TX, reach out to R.M. Mullinix. We would be happy to discuss your options for commercial HVAC service. To learn more or to request an estimate for commercial HVAC service in Bryan or College Station give us a call at 979-822-4079 today.