By now you may have heard the words HEAT PUMP. Its everywhere. On the radio, on tv, in the papers, on the side of trucks, even on the news. Just a short few years ago we couldn't use heat pumps in Maine efficiently. That has changed. Due to changes in technology we can now use them to heat and cool our homes and businesses all year long. With this new technology and if installed correctly you too can be saving money, reduce our dependency on fossil fuels, and be more comfortable in your home. 


Imagine removing the door on your refrigerator. In the winter, you position the refrigerator in a doorway, with its opening facing the outside. The refrigerator works like a heat pump, extracting heat from the outdoor air and bringing it indoors through the coils on its back. In the summer, you turn the refrigerator around so that its cool interior now faces the room. Now, it works like a heat pump to cool your house.

Heat Pump showroomHeat pumps move heat from one location to another. Each pump has four main components: compressor, condenser, expansion valve, and evaporator. Heat pumps work by altering a refrigerant between its liquid and vapor phases in a closed loop.

A heat pump's refrigeration system consists of a compressor and two copper coils (one indoors and one outdoors), which are surrounded by aluminum fins to aid heat transfer. In heating mode, liquid refrigerant in the outside coils extracts heat from the air and evaporates the refrigerant into a gas. The indoor coils release heat from the refrigerant as it condenses back into a liquid. Heat pumps also have a cooling mode: there is a valve to change the direction of the refrigerant flow. This mode can also be used to defrost the outdoor coils in winter.


Andy Myer from Efficiency Maine explains how a heat pump works.


Low Upfront Cost

With a simple less costly installation, Air source heat pumps could become the lowest cost option for heating and cooling.

An Efficient Option

The units we provide have a great efficiency ratings. Our air source heat pumps have a heating seasonal performance factor (HSPF) over 10. Anything 8 or over is considered energy efficient. The seasonal energy efficiency rating (SEER) ratings are as high as 27 (SEER ranges from about 13-33).  

In Maine, on an annual average, a good quality cold climate air source heat pump will provide about 3 units of heat for each unit of electricity. These units can draw heat from the outside, and operate at full capacity, even when it is negative 15°F.

The pumps have 150-300% efficiency (or a “coefficient of performance” of 1.5-3.0), meaning 1 unit of energy produces around 1.5-3 units of energy. A traditional plug in heater yields 1 unit of heat for each 1 unit of electricity. These pumps perform much better than most combustion-based heating and cooling systems.

Heating and Cooling in One

Air source heat pumps provide both heating and cooling with one switch. This eliminates the need for 2 systems and increases the value of your home immediately.


Air source heat pumps have a simple design and few moving parts. This makes them highly reliable, extremely quiet, and very low-maintenance.

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  • Hi Dawn, The installers have finished, and I just called April and gave her my credit card payment. The guys were right on time and did a great job, cleaned up nicely and were a pleasure to work with just like you said! Thanks again for all your help, Gail
    Cindy & John B.

  • Hi Todd! We just had heat pumps installed at our house this week by your company, Central Maine Heat Pumps. I just wanted to share with you how pleased we were with the excellent service that we received right from the start. I found your company by googling heat pumps.

    Cindy & John B., Augusta, ME
  • We were very pleased with the installation and so far are happy with the heat pump. The crew was very friendly and professional. Thank you.

    Anne A.
  • We just got one installed in Winslow. The crew that installed it were very professional and fast! We are very happy! Thank you!

    Trish W., Winslow, ME
  • We love our heat pumps! We have always heated with wood and plan to continue to supplement our heat pumps with wood when it is very cold.

    Jenny and Dan
  • Dawn, Thank you for the ceiling work. I have not inspected it myself yet but my tenant said it looks great. I'll likely have a look this evening myself, but I am confident in the quality. I'll be in touch come springtime.

    Brendan S.
  • Good morning Dawn.

    Awesome job! 

    Kevin W.
  • Thanks April! You've been wonderful to work with! I anticipate that we'll be doing some of the other things Todd recommended, perhaps later this year or next spring. 

    Bruce S.
  • Dawn, I just wanted to shoot you a final follow up email. Thank you to you and all those who helped us get the new heat pump installed quickly and affordably with no hassle. The heat pump worked wonders during that humid stretch last month, my wife loves it!

    Nick C.
  • I am very pleased with the work Central Maine Heat Pumps did for me. Their energy consultant designed a well thought out plan answering all my concerns and questions. The installers were very professional arrived on time and left everything very neat.

    Elizabeth C.
  • Dear Dawn & Todd, Thank you very much for all you have done to help me get the Bridgton property up and running. I truly appreciate you working with my banks requirements on payments. Please reach out if you need a reference.

    Heather F.
  • Thank you so much for the great and friendly service, We are very pleased with the work and our flower gardens never even touched. I would recommend you to all our friends, family and anyone else who asks us. A very pleased and happy customer. Thanks again. We will be return customers.

    Marie D
  • Hello! Just wanted to send along a thank you for the work you did! I appreciate your commitment to excellence and customer satisfaction. We are loving the doors and heat pumps so far and know that in the winter the full effects of the changes will really be felt!

    Carrie H.
  • We wanted to stop paying the high oil bills and contacted Central Maine Heat Pumps for information on how heat pumps work. After getting an estimate and advice on other energy savings from their company we had one installed in our home. We saved $2500 in oil costs the first year.

    Doug & Margo
  • Central Maine Heat Pumps recently installed 78 Fujitsu Heat Pumps in WenBelle Apartments, Bucksport, Maine.

    Lloyd W.