If submitting a service request after hours or on the weekend, please note it is best to call.
(361) 235-3905 Request Service

Your Air-Source Heat Pump: Its 3 Cycles

November 12, 2013 | Blog

The heat pump’s flexibility makes it one of the most practical options for staying comfortable in any type of weather the Coastal Bend offers. Three heat pump cycles are necessary for your system to do its job. Knowing how each cycle works helps you understand your heat pump’s maintenance requirements and spot malfunctions that need attention.

  1. The heating cycle: During this cycle, your heat pump draws warmth from the outdoor air and transfers it into your home. The cycle starts in the outdoor unit, where liquid refrigerant flows through the expansion device and then into the outdoor coil. In heating mode, the outdoor coil works as the evaporator coil. As the fan pulls outdoor air over the coils, the refrigerant absorbs heat from the air and turns into a vapor. Next, the refrigerant vapor passes through the compressor, then to the indoor coil, which acts as the condensing coil. The indoor unit removes heat from the coils. The refrigerant condenses into a liquid and then flows back outside.
  2. The cooling cycle: In this cycle, the heat pump works in reverse, drawing heat from your home and releasing it outdoors just like a conventional air conditioner. This is possible, thanks to a device called a reversing valve, which reverses the refrigerant flow so the outdoor coil becomes the condenser, and the indoor coil becomes the evaporator.
  3. The defrost cycle: The only one of the heat pump cycles that doesn’t change your home’s temperatures, this cycle is still important for maintaining your heat pump’s efficiency. Under certain conditions in the heating cycle, moisture on the outdoor coil freezes, reducing the system’s efficiency. To defrost the coil, the heat pump switches into cooling mode, sending hot refrigerant to the frozen coil. The outdoor fan stops until the coil is thawed. A demand-defrost system, which defrosts only when necessary, is the most energy-efficient option.

If you’re having trouble with one of these heat pump cycles, or you’re considering installing a new system, contact CCAC, In Corpus Christi and throughout the Coastal Bend, we help homeowners meet their heating, air conditioning, dehumidification and insulation needs.

Our goal is to help educate our customers in Corpus Christi, Texas about energy and home comfort issues (specific to HVAC systems).  For more information about heat pumps and other HVAC topics, download our free Home Comfort Resource guide.

Image courtesy of Shutterstock

Constantly Concerned About You!

Professional Team
Our ac technicians are highly trained, professional and committed to getting the job done right the first time.
Reliable Service
You can count on our expert ac technicians to provide high-quality air conditioning services with quality products and transparent pricing.
Customer Service
You deserve excellent customer service. That's why we strive to be courteous and professional through the entire service process.

What Our Customers Are Saying

Very Satisfied

I’ve had a system purchased and installed by them for several years with the maintenance contract the whole time. I’ve been very satisfied with the service. You can’t go wrong selecting them for your business.

Joseph S.

Pleasure to Work With

Mathews CCAC conducted the semi-annual inspection of the A/C, heating system for the fall check-up, Technician was on time, courteous and went quickly about the inspection and observed all COVID-19 protocols for his and our safety a pleasure to work with this company

Steven L.

Great Company

Great company. Contacted my current AC company to check on my warranty before charging me anything. Saved me a bunch of money and headache if dealing with anything. Would definitely recommend them and use them again.

Ryan W.