What’s an HVAC system, anyway?

What’s an HVAC system, anyway?

Heating, air flow, and air-con (HVAC) tools could be a little bit of a thriller to owners. It’s possible you’ll know that your property has the flexibility to remain air conditioned with simply the push of a button, however you need to know extra concerning the machines which might be working so arduous for you. Learn on for a full definition of your indoor air-con machine elements.


In the course of the sizzling summer season months, the air conditioner is the star of the air-con front room. Your air conditioner attracts in air from outdoors and cools and dehumidifies it because the air passes over a chilly metallic coil. This coil is itself an air-to-liquid warmth exchanger, which implies that the recent air absorbs the chilly from the coil, and vice versa. Rows of tubes cross chilly liquid via the coil, and the flat surfaces linked to the tubes create a big cooling floor, growing the quantity of air that may be cooled at one time. Extra chilly floor equals extra cool air. The kind of chilly liquid used depends upon the system you could have, however it may be liquid refrigerant or chilled water with added freeze safety. Whatever the liquid medium used, the liquid is provided to the cooling coil at a chilly temperature.

When this liquid passes via the cooling coil, two issues occur to the air passing over the floor of the coil: the temperature of the air is lowered (cooled) and the moisture within the air is eliminated (dehumidified). The cooling potential of your air conditioner depends upon how properly it cools and dehumidifies the air. You will need to be aware that elements comparable to the surface temperature can have an effect on the cooling capability of some machines. When cooling is inversely proportional to outside temperature, a machine’s potential to chill indoor air is decreased because the outside temperature rises. Likewise, indoor temperatures and humidity have an effect on your machines in the identical manner. Most AC tools producers present a person information that reveals the change in effectivity of machines as indoor and outside temperatures and humidity change.


Central air conditioners are normally paired with a fuel or oil furnace to offer warmth to your property via the identical set of air ducts. Alternatively, there are central HVAC models known as warmth pumps, which mix each heating and cooling capabilities. Should you warmth your property with electrical energy, a warmth pump system might be extra environment friendly in temperate climates, offering as much as thrice the heating per electrical vitality consumed.

Air conditioners and warmth pumps use completely different elements to functionally cool or warmth the air in your house, however the primary working rules are the identical. The warmth pump transfers warmth from the evaporator coil to the air and circulates the now heated air via your property. A warmth pump’s warmth coil truly extracts warmth from the surface air (sure, even chilly winter air carries warmth that may be extracted by your system). Warmth pumps are sometimes put in with a supplemental furnace to assist warmth your property throughout occasions when solely a small quantity of warmth might be extracted from the surface air.

Varieties of methods:

Typical properties use a “cut up” HVAC system, with the air-cooled condensing unit positioned outdoors the home and the coil inside. The opposite kind out there is known as a “packaged” air conditioner, and it combines the condensing unit and coil into one outside unit. The most effective unit for you relies upon solely on the placement and development of your property.

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