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  1. #14
    Join Date
    May 2008
    Posts
    40
    Quote Originally Posted by andserco View Post
    Does this system have dehumidification controls?....
    Yes, the new system has humidity control. In my mind, that is the only plausible explanation for higher energy use since the system may be running longer to control humidity. I have no idea if it is running longer. I have the humidity set at 40%. Even so, the energy usage spikes are weird.

    I have not changed any duct work other that what the install company did at the furnace to adjust for the smaller furnace size. My dryer is gas. My giant electric hog of a hot tub was turned off at the same time as the heat pump install on May 30.

    While I was not expecting a significant savings, I did expect to see 10-15% in lower electric utility bills, not 20% higher. Again, all other electricity uses in the house are the same between May and June. The only variable is the hot tub no longer drawing power and the outside temp/humidity being higher.

  2. #15
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,556
    What thermostat is installed.
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  3. #16
    Join Date
    Jun 2003
    Location
    Madison, WI/Cape Coral, FL
    Posts
    6,585
    Quote Originally Posted by thegov3 View Post
    Yes, the new system has humidity control. In my mind, that is the only plausible explanation for higher energy use since the system may be running longer to control humidity. I have no idea if it is running longer. I have the humidity set at 40%. Even so, the energy usage spikes are weird.
    higher.
    Humidity control-dehumidistat or humiditrol? Fan "on" or "off"? Humidity control should approx. 50%RH. Lower is impossible under many conditions and use alot of electricity trying. Regards TB
    Bear Rules: Keep our home <50% RH summer, controls mites/mold and very comfortable.
    Provide 60-100 cfm of fresh air when occupied to purge indoor pollutants and keep window dry during cold weather. T-stat setup/setback +8 hrs. saves energy
    Use +Merv 10 air filter. -Don't forget the "Golden Rule"

  4. #17
    Join Date
    Jul 2006
    Location
    Virginia
    Posts
    4,796
    call the company that installed it if they cant find the problem have them call a lennox tech rep to look at it

  5. #18
    Join Date
    May 2008
    Posts
    40
    Quote Originally Posted by beenthere View Post
    What thermostat is installed.
    Honeywell IAQ is the t-stat. I have it set to achieve 40&#37; humidity (dehumidify) and it is on "Auto". Temp is set to 73* during the day and 76* at night. It easily achieves the 40% humidity. It has even gotten below that some times (38%).

    I can have them increase the CFM. It was set slightly below the factory set point. Would that help reduce run times? I know humidity would be harder to control.

  6. #19
    Join Date
    Jan 2004
    Location
    Lancaster PA
    Posts
    68,556
    Usually better off with the blower set closer to 400 CFM per ton and letting the IAQ slow the blower if the humidity gets high.

    Most likely, your old system didn't keep your humidity anywhere near 40&#37;RH. And now keeping it that low, you are increasing the run time the A/C has to keep the humidity that low. There by raising your electric usage.
    If you set your humidity to 45%, and the blwer to 400 CFM per ton, you'll see a drop in electric usage

    If you want to maintain a 40%RH. Either check into sealing your homes envelope better, or settle with having a high electric bill.
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