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  1. #14
    Join Date
    Jan 2009
    Location
    Keokuk, IA
    Posts
    5,520
    2 tons keeps my 1500 sqft upstairs cool to 73F about 98F (above design temp)... and while it does have a lot of shading, there's no formal wall insulation and it has about 20 good sized windows. My 1700sqft downstairs wiht 9' ceiligns and about 20 taller windows will be getting a 2 ton unit when I replace it soon. It can almost get by with 1.5Tons, but throw in people and appliance loads and that pushes it to 2 tons. But each home is different.

    Remember with properly sized systems you can't and do not want to use setbacks in the daytime in summer. IT will never catch up. A larger upstairs like your should have a properly sized AC running nearly constantly for 6-8 hours when it's over 90F, humid and sunny outside.

  2. #15
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,186
    BTW your overall power bill will be LESS using properly sized equipment and just letting it run instead of oversizing and using a setback strategy. A correctly sized unit will eventually catch up with setback, but may take until midnight to do so.

  3. #16
    Join Date
    Jan 2008
    Location
    Texas
    Posts
    1,740
    Haven't checked in awhile but there may be times when setback could potentially make sense. Peak electrical are during the day and off peak in the evening. Rates are better in off peak hours.

  4. #17
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
    Posts
    4,186
    Quote Originally Posted by fliks View Post
    Haven't checked in awhile but there may be times when setback could potentially make sense. Peak electrical are during the day and off peak in the evening. Rates are better in off peak hours.
    If you have time of use rates, absolutely makes sense
    We have them here and the strategy is to overcool the house before 2pm, then let it get warm. At 7pm when the peak rates are over bring temperature back to normal. For us it's 72 before 2pm, 80 2pm-7pm, 75 @ 7pm. $120 electric bills for summer in a 3 bedroom house. 2ton unit for 1600sqft.

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