specialsQuality Heating and Air Conditioning Services in Raleigh


Delta Heating & Cooling is a family owned and operated HVAC company serving Raleigh, NC and the Triangle area. We specialize in residential heating and air conditioning repair, service, and installation. Our staff is available 24/7 for all of your heating and air conditioning needs.

When the weather begins to cool, our heating services guarantee that your family is warm and comfortable. As the temperature rises and the hot North Carolina summer arrives, our air conditioning specialists offer fast, professional, hassle free service. Our technicians are are NATE certified and we continuously provide training for our office and field staff to better serve our customers.

Contact us today and let us assist you with your heating or air conditioning maintenance, repair, or installation!

The only way to truly understand your heating and cooling issues is to have one of our HVAC technicians inspect your system but there are some general things to look out for. Based on our HVAC experience in Raleigh, here are the top questions we receive about heating and air conditioning.

Why is my HVAC unit leaking water?

It’s normal for the dehumidifying process of the unit to produce condensation, however pools of water shouldn’t be overlooked. Several factors can cause your air conditioner unit to drip, leak, or drain improperly. Once cause could be a broken condensate pump which can be assessed by verifying the power source and then pouring water into, ensuring it pumps the water out.. Other causes include a clogged drain hole, bad seals, excessive pressure or improper installation. Many homes now have safety switches in the attic within the drain pan or drain line which can shut down the unit if a backup or failure occurs.


Why is my HVAC unit so loud?

Rest assured, all units tend to make loud or strange noises at times. For concerns during winter months, heat pumps often make a woosh-like sound and the compressor can be louder than usual, but both of these sounds are normal as the system switches from heating. Other common loud sounds can occur when your outdoor unit starts up or shuts off, noises similar to an out-of-balanced washing machine or a back-peddling type of sound may be heard. Hearing a metal-hitting-metal type of sound? The fan blades could be banging against something such as tubing or debris such as tree branches. You might hear a buzzing sound coming from your unit, even when it’s not running which is caused by the reversing valve solenoid coil or contactor and in most cases this is normal. Finally, there are always the “vibration” type of noises, which may sound simple, but can be the most difficult to determine the cause. If you hear a new unusual noise and can’t pinpoint the source, we recommend scheduling a service call to check it out to help prevent a major issue or failure.


Why does my air conditioner smell bad/musty?

Check your air conditioning filter. A clogged, dirty, or damp filter cannot filter properly and may be contributing to the problem. Cleaning or changing the filter might not only solve the smelly issue, but it will also help your air conditioner more efficiently and effectively cool your home. Depending on factors in the home, such as pet hair and cigarette smoke, you may need to change the filter more often than recommended.  A number of common smells such as mustiness, rotten eggs, or burning/smoke may be coming from a dirty indoor coil.  This is very common in the spring and fall when the system may run heating in the evenings and cooling during the day. We recommend having the indoor coil cleaned each spring to help reduce any bacteria and dust build up which can increase the chances of unpleasant smells.


Why is my HVAC system not cooling?

This is the top complaint we hear in warm months! First, make sure that your air filter is clean, all windows and doors are closed, and supply and return vents are open and not blocked. If after checking these items, your unit is running but not cooling, it’s time to turn off the air conditioning off and schedule a service-call. Possible causes include an airflow issue (less airflow than normal), low refrigerant charge or a refrigerant flow-related problem, damaged or dirty coils, or a faulty metering device.


What causes air conditioning units to freeze up?

A number of issues or mechanical failures can cause a unit to freeze up. First, air conditioners are designed to cool a home by taking heat away from it.  If an air conditioner is not properly blowing air over the evaporator coil, then this heat exchange cannot take place. Freon inside your unit should be removing heat from your home but cannot in this case, and over time, the temperature of the Freon will drop and an air conditioner can freeze up. If your air conditioner is low on refrigerant or if you are running your air conditioner when the outside air is below around 60 degrees, then your air conditioner can freeze up. It is important to address this issue as a frozen air conditioner will not only cool improperly, but can actually be severely damaged if it keeps freezing. If you find ice built up on the refrigerant lines at the outdoor unit, we recommend that you immediately shut the system off, turn the fan to the “on” position and schedule a service call.  Continuous running while frozen can severely damage a system, sometimes beyond repair.


Why is HVAC maintenance important?

A properly cared for and maintained HVAC unit will run efficiently and have an extended life. A maintained HVAC unit can reduce your electricity, heating and cooling costs. It can also prevent problems with air quality and lead to better breathing for your family. With an annual inspection, an HVAC specialist can catch little problems before they turn into big, expensive ones.