Physics and HVAC

It’s a simple fact of physics that warm air rises and cool air sinks.

  • Heating and air conditioning systems take this into account.

For example, ductless mini-split air conditioning systems should be placed high up on the wall in an area of the house where the unit will not be blocked by furniture to allow for unobstructed air flow. Also, it helps to install the outdoor components of an air conditioning system on either the north or south wall of your home to shield it from the sun. Even having a nearby tree to offer shade can be helpful, although you don’t necessarily want to have debris falling from the tree onto the condenser unit. You generally also want to keep the condenser unit unobstructed by anything in the yard. Keeping physics in mind, one of the most efficient means of heating a home comes in the form of radiant heated floors. Radiant heated floors consist of tubes under the flooring of your home that are heated either by electricity or hot water. Because the heat source is below the floorboards it will naturally emanate upwards, thereby efficiently heating your home as opposed to a forced air HVAC system with vents on the ceiling. Unless you’re 8 ft tall you generally won’t appreciate the heat hanging up there so it’s best to use radiant heated floors, although they can be quite expensive. In summary, the fact that warm air rises and cool air descends is taken into account when it comes to the design of certain heating and air conditionings systems.
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