09 Heating, Air Conditioning, & Ventilation – Preview


The three most common options for delivering heat throughout a house are the following: (1) natural gas powered furnace pushes hot air through ducts; (2) natural gas powered boiler with hot water tubes radiating through the floor; the main drawback of this heating system is it requires a separate system to deliver air conditioning. (3) electricity powered air source heat pump pushes hot air through ducts. Another type of heat pump is a ground source heat pump, also call geothermal, which is less common than the air source heat pump because it is much more expensive to install. The geothermal heat pump is more efficient and sustainable than the electricity powered air source heat pump.

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  1. Determine diffuser and return air grill locations for heating and/or AC: mark locations on subfloor, wall studs or ceiling joists.
  2. Review location for equipment. The furnace is typically located in a basement, while the AC condenser is typically located outside. If you are installing a mini split system, the outdoor equipment can be much larger than a typical AC condenser, so verify the size and make sure you can accommodate it.
  3. Determine and mark location of thermostat.
  4. Verify which materials will be provided by HVAC installer
  5. Verify who will install range hoods, fireplaces, bathroom fans, microwave, and other equipment requiring exhaust ducts