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Learn How Your Heat Pump Works
Any appliance that takes heat from one area and moves it to another is a heat pump.
Most heat pump installations involve what is called a split system. The outdoor unit contains the compressor and a heat exchanger, called a coil. The indoor unit contains another coil, a fan that blows air through your duct system, grille, and electric heating elements.
The outdoor and indoor units are connected by copper tubes that move a gas refrigerant (such as Freon) between the indoor and outdoor coils. This refrigerant has the ability to absorb heat from the air, even at very low (really cold) temperatures.
HERE IS HOW IT WORKS IN THE WINTER:
In the winter, the refrigerant absorbs heat from outdoor air drawn across the outdoor coil. The refrigerant becomes hot but is made even hotter (in excess of 140 degrees F) by going through the compressor.
This hot gas travels through a copper tube to the indoor coil. The fan draws air through your return grille and pushes the air across the indoor coil. The hot gas transfers its heat to the air blown across the coil and into the duct system.
1. Outdoor coil extracts heat from outdoor air.
2. Refrigerant gas carries heat to indoor unit.
3. Circulating indoor air picks up heat and carries it throughout the home.
HERE IS HOW IT WORKS IN THE SUMMER:
In the summer, your heat pump simply reverses the flow of refrigerant. Now the refrigerant absorbs heat from room air blown across the indoor coil. In this manner, heat and humidity are removed from the air, and cool, dry air is distributed throughout your home. (As the heat is removed, or absorbed, the air becomes cooler)
The absorbed heat is carried by the refrigerant through the copper tube to the outdoor unit. Here the refrigerant goes through the compressor, then moves through the outdoor coil, which transfers the absorbed heat to the outdoor air.
1. Indoor coil extracts heat from home’s air.
2. Refrigerant gas carries heat to outdoor unit.
3. Outdoor coil transfers heat to outdoor air.
OPERATING YOUR HEAT PUMP
Set Your Thermostat Wisely
When the outdoor temperature drops below 32 degrees F, your heat pump may need assistance in heating your home. Electric heating elements will come on automatically to help heat your home during severe weather.
Many thermostats have an indicator light that tells you when the electric back-up heat is on. It may be labelled emergency or auxiliary. Generally, you should see this light on only during very cold days. The light may also indicate a problem with your heat pump, such as a clogged air filter.
Setting your thermostat to the lowest comfortable temperature is the best approach to conserving energy and saving money. Frequent to drastic changes to your thermostat setting may cause you to use more energy. Avoid increasing your thermostat setting by more than one degree at a time. A change in setting greater than one degree at one time will cause your electric back-up heat to come on. Whenever your electric back-up heat comes on unnecessarily, you will be wasting energy.
When your heat pump is operating in the cooling mode, there is no back-up heat. You can adjust your thermostat setting up or down without worrying about additional systems coming on. For economical operation, however, you should aim for the highest comfortable temperature when selecting your thermostat setting.
There are many types of thermostats. Please feel free to contact me to discuss the proper operation of your existing thermostat or the selection of a new, energy-saving thermostat.
Don’t Neglect Your Filter
The filter is the most important item to keep up with. This is also the most neglected part of the heat pump--and the cause of many high energy bills! Your filter collects dust particles that otherwise would clog your indoor coil. When your filter is not cleaned or changed periodically, you run the risk of substantially increasing energy consumption, reducing comfort, and causing equipment damage.
You should clean or replace your filter every month. The filter is located in the indoor unit or the return air grille. If you can’t find your filter, give me a call.
Ensure proper air flow.
Proper air flow is critical for efficient heat pump operation. Don’t close off more than 10 percent of the registers in your home. Don’t block a register’s air flow or try to deflect its direction.
Proper air flow is also important for the outdoor unit. Keep grass, shrubbery, leaves, and dust away from the unit for unobstructed air flow.
Watch For These Signs Of Trouble
Other than changing the filter, maintenance should be performed by a qualified technician. Give me a call right away if you experience:
1. Unusual sounds or noise.
2. Thermostat indicator light always on.
3. Unit operating constantly in mild weather.
4. Outdoor unit continuously iced over.
5. No air flow out of registers.
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