Advantages of Variable Speed Air Conditioning Systems

Advantages of Variable Speed Air Conditioning Systems

The majority of all homeowners are familiar with that one room in the house – the one often avoided due to uncomfortable room temperature. Whether the room be freezing in the winter or a sauna in the summer, this temperature inconsistency is undeniably a household nuisance

These cold spots and hot spots are determined by various factors, depending on the home. One reason for the temperature inconsistency is that the home may be poorly insulated due to exposed ductwork in the basement or attic. Even if the ductwork is well-insulated, the house may not be, which will lead to drafts and uncomfortable room temperatures.

Variable Speed Air Conditioning System

Residents of the North Richland Hills area understand the annoyance that inconsistent temperatures cause, particularly throughout the scalding summer months. That is why upgrading too a variable speed air conditioning system is ideal to ensure comfortable indoor temperatures. Compared to the more traditional single-speed units, variable speed air conditioning boasts unparalleled advantages for maintaining the desired temperature throughout the house.

Single-Speed Unit versus Variable Speed System

Aside from consistent indoor temperatures, homeowners will experience better controlled humidity with this innovative air conditioning system – an important matter for those residing in the Fort Worth, Keller, and North Richland Hills area. Variable speed air conditioning systems operate efficiently in that they run for longer periods of time and at lower speeds. This is better than single-speed units that turn off once the desired temperature is reached. Since the single-speed systems are required to startup more frequently, they are worn down faster than a variable speed unit. Therefore, the variable speed air conditioning system boasts a longer life cycle because it starts at lower speeds, gradually working its way up to the desired speed.

Homeowners in the Fort Worth, Keller, and North Richland Hills area who are interested in learning more about the advantages of variable speed air conditioning systems may contact Top Gun Heating and Air. Top Gun Air is a full-service heating and cooling company in the Dallas – North Richland Hills metropolitan area, Texas. Top Gun offers air conditioning repair, air conditioning maintenance, heating repair, and HVAC installation. With a team of only experienced technicians, Top Gun ensures client satisfaction for all services offered in a timely and efficient manner.

Top Gun Heating and Air is available 24/7 and is eager to assist in any air conditioner repair or installation service required. Contact Top Gun Heating and Air to have your HVAC system running perfectly in no time.

Why Is My Air Conditioner Freezing Up?

Why Is My A/C System Freezing Up?

You’ve probably already guessed this isn’t a normal part of the operation of your air conditioning system and you would be correct in that assumption. If you’ve never experienced this, the idea can seem far fetched. After all, not many people are used to seeing a block of ice surrounding their compressor on a 95-degree summer day. Air Conditioning and Refrigeration systems freeze for different reasons depending on what is impacting what part of the refrigeration cycle (see below) These reasons can be listed under 4 different categories; airflow loss, refrigerant loss, mechanical, and temperature.

The first reason for you’re a/c system freezing is probably the most common. The freon pressures in your system rely on the absorption of heat in the evaporator section. This is typically transferred from air that is pulled in from your house into the air handler unit and across the evaporator coil. With a loss of air flow comes a drop in temperature below freezing at the evaporator section causing the water molecules in the air to form frost on the indoor coil which eventually builds into a layer of ice. The most common cause for airflow loss are listed below.

  1. Dirty filter at the return air duct on the system, or too restrictive of a filter (filters have a MERV rating, the higher the rating the smaller the particle it will filter)
  2. Burned out Indoor Blower Motor, or Motor that has too weak a capacitor to start the motor. Often times a humming noise can be heard at the air handler unit
  3. Bent, or Broken Blower Wheel unable to turn and provide airflow. A dirty blower wheel will often cause motors to fail prematurely and will not move enough airflow.
  4. A dirty evaporator coil, usually caused by the lack of a filter at the return, or too infrequent changing of the filter (very common) This requires the evaporator to be pulled and cleaned professionally
  5. Improperly sized duct work, crushed or collapsed duct, insulation blown loose in system blocking air flow. Improperly installed duct work
  6. Blocking of the return air grille either with furniture or other obstruction
  7. Too many Vents or Registers closed

The second category is refrigerant loss. This is another very common cause for a/c systems freezing over. Each system is charged with an exact amount of refrigerant or freon that is used to transfer heat from your home. Age of a system, improper installation, acidity of refrigerant, or manufacturing flaws can cause systems to leak refrigerant. The size and severity of the leak is situation dependent. Loss of pressure in the system cause the temperature of the refrigerant to drop below freezing temperatures and form ice on the evaporator coil and travel outside to the condenser via the copper lineset. In rare cases overcharging a system may result in no superheat and the air conditioning unit to freeze over.

Other causes of an air conditioning system freezing are mechanical related and are listed below.

  1. A clogged liquid line filter drier. Which is typically a result of a poor quality installation, and improper evacuation during installation of a central heating and air system.
  2. A kink in the liquid line, or restriction in the system at the TXV (thermostatic expansion valve) near the entrance to the evaporator coil.
  3. Liquid line valve not fully opened.
  4. A restriction in the metering device (see picture below) which can either be a fixed orifice, capillary tube system, or TXV with a faulty power head. This can also be related to poor installation practices and lack of filtering device installed in system.


The last cause for a air conditioning system freezing over is temperature. When we are referring to temperature in this circumstance we are typically talking about the outdoor ambient temperature. A low outdoor ambient temp can cause the pressures in the system to drop below normal and cause freezing of the air conditioner. This problem is typically resolved with a lockout device installed on the air conditioning unit by the manufacturer. Not all systems are equipped with this type of control though. Typically running you’re A/C system in outdoor ambient of below 60 degrees is not recommended. Freezing can also occur when the indoor temperature at the thermostat is set too low. This puts unnecessary wear and tear on the system. On a residential system the indoor temperature should not be set below 68-70 degrees unless equipped with controls that prevent a freezing over situation.

When the air conditioning system freezes over it can cause the Freon to return to the compressor in a liquid form and cause slugging of the motor. Modern scroll compressors are better equipped to handle this situation than older style units. However, it can still cause damage to the system and should be assessed by a professional if it ever occurs.

The friendly professionals at Top Gun Air can provide an honest assessment and leak detection service if needed. For scheduling of appointments check us out online. If you have questions regarding freezing of your system and would like to speak to one of our helpful, friendly staff, give us a call at (682) 214-0431. We hope you find this article informative and helpful.

Why Is My Air Conditioner Blowing Warm Air?

In Fort Worth when your air conditioning system is blowing warm air, those words have probably crossed your lips or run through your mind as you fumble with the thermostat trying to revive that source of cool air. So what causes your A/C system to blow warm air? before you whip out your phone to google local air conditioning service providers, read the following.

There can be many causes of your air conditioning unit blowing warm air. We can’t cover all of them in this article, but we’ll address the most common ones.

1. Check your Thermostat. Is the display visible? if not, try changing the batteries, then check again. Are there loose wires or connections on the baseplate attached to the wall? Thermostat manufacturers include a wiring diagram if you get lost or are unsure of what goes where. Some thermostats have a time delay built in to them to prevent short cycling the compressor. Wait five minutes then check system again if you’ve recently raised or lowered the temperature

2. Check to see if your outdoor unit is running. Chances are, if this unit isn’t running you won’t be getting cool air. Your central heating and air conditioning unit is made up of different components. Residential a/c systems are usually called split systems. The outdoor unit houses your compressor and condenser fan motor. If the unit is dead, but you hear a humming sound coming from it. Check the breaker at main panel to ensure you have power going to the unit. Chances are most times, a capacitor has gone out on it. pull your service disconnect to kill power to condenser and inspect the condition of the capacitor (a silver cylindrical object in the control panel of condenser.) often times you can determine if its bad if it appears to be bulged out at the top. Other ways of testing involve a special meter designed to read capacitance, measured in mFd. When in doubt, change it out. Other causes of the outdoor unit not working are; a burned out condenser fan motor (intermittent, or non-functioning completely) a bad compressor, and a bad contactor.

air conditioning system, condenser, outdoor a/c unit, compressor

3. A dirty condenser coil can cause the compressor to go off on thermal overload. This condition is caused by lack of routine maintenance. be sure to have your A/C system serviced at least every year or two. Part of this maintenance should include washing the condenser coils on your air conditioning systems outdoor unit.

dirty condenser coil, ac system, air conditioning unit, central heating and air

4. Check Thermostat wire connections at outdoor unit. Dogs love to chew things. One of those things could be the low voltage control wires going to your outdoor unit. If you notice wires with bare copper showing or insulation peeling off them you may have suffered a short in the low voltage system. This can be a relatively inexpensive fix, but would require a professional’s assessment.

5. Look for ice build up on the line set running to the outside unit, or around the compressor. This can be a sign that your A/C system is running low on freon. The refrigerant you have in your system runs in a closed loop, and is a constant volume. Unless of course you have a leak in your system, or an excessively dirty air filter. This situation should be properly assessed by a local Fort Worth service professional. If its been a while since your last filter change, remove it from the system, and wait a couple hours before restarting the system. This is a very common condition found in many of the Fort Worth area homes. Often systems 10 years of age or older suffer from small leaks in the evaporator coils on your air conditioning unit. This causes the icing condition, which can restrict airflow coming from the vents.

Why Is My Air Conditioner Blowing Warm Air? Air Conditioning

There are many more causes of your A/C system blowing warm air that aren’t limited to restricted metering devices, bad printed circuit boards, improper thermostat programming,  and burned out compressor motors. All of the above will require a local service professionals diagnosis. If you are in the Dallas-Fort Worth area feel free to reach out to us by visiting or call us at (682) 214-0431. We are a local family owned and operated business that stakes our reputation on providing quality repairs. Long term customer retention is our highest priority. Given the opportunity to serve your family we guarantee not to disappoint. We take care of our people, by providing fast, reliable repair, at a fair price.