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In many cases a homeowner does not know what to expect from their new heat pump system.  The information listed below should be helpful. 


  1. During the cooling season, the heat pump operates like a conventional air conditioning system.  


  1. During the heating season, the heat pump rarely delivers hot (135°F) air, but delivers large quantities of warm (90°F) air.  The unit will probably run almost continuously in cool weather.  It was designed to do so.  


  1. The outdoor unit will “change tune” slightly as it moves from cooling to heating as the temperature varies, or as frost builds up on the outside coil.  


  1. There will be moisture draining from the surface of the outdoor coil when the unit is in the heating cycle.  This moisture will turn to frost when the outdoor temperature fall bellows 40°F.   


  1. The outdoor coil may become totally white with frost during cold weather.  Unless this condition persists for over 1½ hours without defrosting, the customer should not be disturbed.  Frost will build up most rapidly during damp, cool weather (28°F to 38°F).   


  1. When the heat pump defrosts, it will, without stopping, give a slight “swoosh”, stop the outdoor fan, and briefly deliver cooler air inside.  The duration of its defrost cycle will vary from 30 seconds to 10 minutes, according to the amount of frost on the outdoor coil  


  1. Steam or fog from the outdoor unit is normal during defrost.   


  1. During cold weather (usually below 35°F), the auxiliary heat light on the thermostat may come on and off as the 2nd stage heat is activated.  This light may also come on during defrost.  This is normal.   


  1. The emergency heat switch on the thermostat is to be used when there is a problem with the outdoor unit.  This switch only shuts down the outdoor unit and runs the system on 2nd stage (auxiliary) heat.   


  1. It is extremely important that nothing restricts airflow or the defrost water runoff near the outdoor coil.  Leaves, grass clippings and the like should be cleaned off the outdoor coil.  In snow country, drifting snow should be cleaned from around the unit.   


  1. Return air filters must be cleaned or replaced monthly.  Dirty filters restrict airflow and increase operating costs.   


  1. Indoor air supply diffusers must not be blocked or restricted by furniture or draperies.   


  1. Night setback during the system’s heating mode is not recommended, unless you have an intelligent recovery thermostat.  The heat pump seldom has the capacity to raise space temperature quickly.  Heating setback (maximum 10°F) will provide some economy if the space is to be left unoccupied for two or more days.   


  1. It is recommended that the system have a professional service and maintenance check once or twice a year.  After your warranty expires, this service is provided by us, on a routine basis, via a Service-Maintenance Agreement.   


Our company spares no effort in the schooling of our technicians.  The fact is our heat pump service technicians are among the most skilled in the industry and have been factory trained and certified on your particular equipment.    

If you should have any questions regarding the operation of your heat pump, please don’t hesitate to call.










  • Maintenance Service Agreements
  • Preventive Maintenance
  • Trained, Licensed and Insured Technicians
  • 24 hour answering with response service
  • Major inventory of parts
  • Service All brands
  • Free Second Opinions
  • Free Replacement/New System Estimates
  • Generator Service and Installation
  • Humidifiers
  • Air Purification Solutions
  • Rotobrush Duct Cleaning
  • Water Heater Service, Repair, and Installations


Prevent costly breakdowns by having your home's comfort system inspected today.
 $89.95 per system
Not Valid with any other offer or discount. Residential Only


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What customers said

Best heat pump installation I have ever seen, outstanding craftsmanship. Took the time required to do the installation correctly. Thanks for a job well done.

R R Laurel MD


Love your prompt service keep up the good work!!

Donald W    Jessup MD 


We are very happy with our new A/C and Heating System; the Air Scrubber & Aprilaire filter were great additions to our system. The air quality in our home is much improved!

David B.  Laurel MD


John and his helper Guy did a awesome job. They are like family to us. Great Guys.

L. Norris Germantown MD


Excellent Job - Professional  & On-Time Thank You!!

Benny Y Gaithersburg MD


We were very happy with the installers and what a super job they did. Bob Nestor and helper were very professional.

R Ehrenreich  Gaithersburg MD











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Multiple Locations

Serving the Baltimore/Washington Area & Northern Virginia

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Rockville Office & Corporate Headquarters


DC Metro Area 301.881.2700
Gaithersburg 301.330.0040
Germantown 240.243.1150
Silver Spring 301.589.3440

Anne Arundel County

Annapolis 410.266.7900
Odenton 410.672.1551
Toll Free 866.366.9975

Baltimore Metro

Baltimore 410.876.2100
Harford County 410.592.9118
Timonium/Towson 410.592.9118

Calvert County


Carroll County

Westminster 410.848.4700

Frederick County

Frederick 301.662.0611
Mt. Airy 301.831.4355

Howard County

Columbia 410.997.2700
Toll Free 888.453.6811

Queen Anne County

Kent Island 410.820.4684

Prince George's County

Bowie/Mitchellville 301.261.8629
Laurel 301.937.0404

Northern Virginia

Arlington 703.524.6700
Ashburn 703.729.7666
Centreville 703.322.2000
Fairfax 703.560.9444
Leesburg 703.779.4700

Northern Virginia Continued

Manassas 703.257.9444
Reston 703.860.2477
Springfield 703.644.1000
Sterling 703.450.2000


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