Con: No Temperature Zoning Forced air systems use one thermostat to control the heat in every room of a home. This central temperature control may be inconvenient if you want one room to feel warmer than the others. Increasing the temperature on your thermostat to heat that one room will also heat the entire house.

Common Causes of an Air Conditioner Blowing Warm or Hot Air These can be due to clogging issues, electrical problems, low refrigerant, evaporator coil malfunctions, or compressor problems. If you've ever had the ac system in your car stop functioning, it's often due to a refrigerant leak or dirty coil.

Forced-air furnaces are extremely efficient. Furnaces have a high AFUE rating around 78-84%. AFUE rating stands for “Annual Fuel Utilization Efficiency.” The higher the AFUE percentage the more heat the furnace can deliver relative to the amount of fuel consumed.

Forced air heating relies on a furnace or heat pump to distribute warm air through a network of ducts, while central heating uses a central heating unit, such as a boiler, to circulate heated water or air through pipes or ducts to radiators, baseboard heaters, or underfloor heating systems.