dragon air dallas heat pump

Heat Pump an HVAC Unit

 A heat pump is an HVAC unit that heats or cools by moving heat. During the winter, a heat pump draws heat from outdoor air and circulates it through a home’s air ducts. In the summer, it reverses the process and removes heat from the house, and releases it outdoors. 

Variable operation 

Heat pumps can work at either a single level of operation or two stages of operation. Lennox has the quietest and most efficient single-stage and two-stage heat pumps you can buy. 


Single-stage HVAC systems are still the most common systems used.  

A single-stage heat pump has only one level of heat or cold output. 


Two-stage cooling means the heat pump has a compressor with two levels of operation: high for hot summer days and low for milder days. Since the low setting is adequate to meet household-cooling demands 80% of the time, a two-stage unit runs for longer periods and produces more even temperatures. 

Longer cooling cycles also translate to quieter, more efficient operation and enhanced humidity control. Compared to a single-stage unit, a two-stage heat pump can remove twice as much moisture from the air. This is important because when moisture levels are high, there’s a higher potential for mold and other pollutant problems. 

Principle of operation 

Heat will flow spontaneously from a region of higher temperature to a region of lower temperature. Heat will not flow spontaneously from lower temperatures to higher, but it can be made to flow in this direction if work is performed. The work required to transfer a given amount of heat is usually much less than the amount of heat; this is the motivation for using heat pumps in applications such as heating water and the interior of buildings. 

Air source heat pump 

Geothermal (ground-source) heat pump 

Exhaust air heat pump 

Solar-assisted heat pump 

Water source heat pump 

Hybrid heat pump 

Dragon Air Services is a family-owned business located in the heart of Plano. We specialize in residential Air Conditioning and Heating repairs, Air Conditioning, and Heating replacements, and Air conditioning and Heating service. Our expert technicians pride themselves on providing honest diagnostics so our customers can make educated decisions on what’s best for them. If you are in need of replacing an HVAC unit in Dallas, Plano or surrounding cities call us today at 214-790-9872 to schedule an appointment.  

Here’s the list of services we provide in Plano and Collin County  

AC repair  

AC Replacement  

AC Installation  

Heater Repairs  

Heater Replacements  

Heater Installation  

AC and Heater Preventative Maintenance Furnace Repair  

Furnace Replacement  

Furnace Installation  

Duct Replacement  

Duct Design