Heat Air
Is it true that even though a central heat & air unit may run 24/7, it's NOT using MORE electricity?
My central heat & air unit is a little too small for my house (my landlord finally admitted it, but doesn't feel that its enough of a difference to have it changed it). This causes it to never get to the exact temperature needed & stay long enough for the unit to cut off. I'm concerned that my electric bill is going to be sky high. My landlord assures me that because it's a smaller unit, it is actually going to use much less power. That even though it never shuts off, that doesn't mean it will run my power bill up. Is he right or is he just saying that to get me to shut up (for now)?
Yes, if everything is working correctly and both systems are operating at the same efficiency, then he's right. In fact, you should use LESS electricity than if you had a larger system running intermittently.
This is because less power is required to operate a small system than is required for a large one, and because a certain amount of energy is wasted each time the system starts and shut down. The wasted energy is mainly due to the need to build up high pressure in the condensor of the system when it starts up and the unused cooling in the evaporator when the system shuts down.
However, if your system is running all the time, it could wear out sooner. In addition, this could be as sign that it is working inefficiently due to a problem and needs repaired.
From US DOE:
Proper sizing and installation are key elements in determining air conditioner efficiency. Too large a unit will not adequately remove humidity. Too small a unit will not be able to attain a comfortable temperature on the hottest days. Improper unit location, lack of insulation, and improper duct installation can greatly diminish efficiency.
http://www.eere.energy.gov/consumer/your_home/space_heating_cooling/index.cfm/mytopic=12350
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