I live in a 2 Bedroom row home.
I run Central Air during the day & at night i shut it off & use a 8300 btu
Air conditioner in the bedroom.
Whats the best practice,what im doing or leave the central on 24/7 ?
Too many variables to answer definitively on the minimal information
provided. Depends on how much C/A runs vis a vis the window unit, how
much more is required to "catch up" the remainder of the house the next
day if any, relative efficiencies of the units, etc., etc., etc., ad
What would be most effective would possibly be to open the house at
night and use attic fan and then close up the house early in the
mornings. If, of course, you're in a very humid area that doesn't cool
off at night, that may somewhat less effective.
It really depends on humidity levels. High humidity really kills
efficiency at the evaporator coil. It takes a lot more energy to
condense water out of humid air than it does to pull heat out of hot
dry air. So if you open windows on a cool but humid night, it may
actually take more energy to rid the house of all that moisture the
next day. It also depends on the heat loss on the South facing side of
the house. If you have a lot of windows on the South wall and turn the
central off during the day, you may have a HUGE heat load to get rid
of when you get home.
What you are doing now sounds best.
If you want to save some electricity, try limiting the use of the
central air to only enough to dehumidiy the whole house and run the
bedroom window unit enough to cool the bedroom. It's what I do.
Yes, I agree. You're saving energy by just cooling the bedroom with
the window unit at night, instead of the whole house. You can have
the central AC on an automatic thermostat so it gets set to
essentially be off at night and resume 90 mins or so before you get up.
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