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Thread: Argh! Paying twice for the same dang work.. (heater and AC)

  1. Back To Top    #1

    Join Date
    Apr 2007
    Location
    Livermore, CA
    Posts
    32

    Argh! Paying twice for the same dang work.. (heater and AC)

    So frustrating... I want/need to heat my pool - current day temps are in the mid 70s. You see, I live in a pretty dry area that gets pretty cool at night (day/night swing is generally 30+ degrees) so even though it's 90+ outside, my pool won't get hot. On the other hand, I need to cool my house down, so I run this here AC unit, and it sucks the heat out of the air and pumps it through my house all chilled. That heat is completely wasted.

    Anyone ever played around with any mechanisms for either a) capturing that heat and dumping it into the pool, or b) using a pool heat pump and pumping the 'waste' cold air into the house? Would a heat pump even work well in low humidity?

    Next summer I've been planning to have solar panels installed, but that still means I'm wasting all this AC heat....

    thanks
    Darren
    ~20K gallon freeform w/attached spa
    Pentair 4x160 pump
    Pentair Mastertemp 400K BTU heater
    Intellitouch i7+3 controller
    Intellichlor IC40

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,887
    There are products like this one which transfer heat from your attic into your pool, but I haven't heard of anyone who actually had one.

    Roof mounted solor panels will cool your roof, which will reduce the load on the AC.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3
    Ohm_Boy's Avatar
    Join Date
    May 2007
    Location
    Orlando, FL
    Posts
    1,344
    My old house in Florida had a box called a Heat Recovery Unit plumbed into the heat pump and the hot water line. We could literally turn off the breaker for the hot water heater during the summer, as this unit heated our home water from heat pump waste heat. Florida Power used to have some odd info on them.
    I don't have time for heavy searching right now, but run a Google on heat recovery unit and see what you can find. It will have to be piped into the refrigerant line on the condenser unit, so you'll have to have an AC guy hook it up - they may be able to help you find one.

    [EDIT] I found this link: http://trevormartin.com/hru.asp - they have listings for several make/models of HRUs [/EDIT]
    [center:1kpalu48]Helpful Links: Pool School | CYA/Chlorine Chart | Pool Calculator[/center:1kpalu48]

  4. Back To Top    #4

    Join Date
    Aug 2007
    Location
    Forest Hill, MD
    Posts
    6
    I just went to a geothermal heating/cooling unit for the house, with 2, 300' wells as the heat sync for the geothermal unit. It comes standard with a "desuperheater" that puts waste heat into the std. electric hot water heater in summer, and it alternatively uses part of the heating capacity to more cheaply preheat the hot water heater in the winter. It appears the "desuperheater" is pretty much the same gadget as the "heat recovery unit" mentioned.

    I too kept lookiing at this and wondered, isn't there a way to heat the pool???? But the main system already blew the budget to kingdom come, and trenching 100' down the hill to the pool with the geothermal loop seemed just too expensive. Not to mention, geothermal expertise is rare enough, messing with the pool too would go beyond the contractor's commonplace experience....and I prefer not to be on the bleeding edge.... I guess ONE way would be to power off the hot water heater, and top up the pool from HOT water. But with my luck, about the time the hot water heater was truly spent, my wife would go try to take a shower, and I'd be VERY unpopular....

    My impression is that the pool would want A LOT of capacity in the spring/fall, possibly while the house still wanted heating.
    My "if only money was no object" thought for northeastern Maryland (water eventually gets too hot in summer, but fairly short pool season and lots of snow & ice in winter) would be a second entire geothermal system, with its own wells/trenches/pond/whatever, and use it to HEAT THE POOL in the spring/fall/litle of summer, and to MELT ICE ON THE DRIVEWAY in winter.

    Can't afford the thought, of course. So the pool is unheated, as it's been since 1971. FWIW, the pool water's been warmer this summer than ever before.

    I just got a full month's bill AFTER BGE's recent 50% rate hike. My avg daily kWH consumption is down 23% from same month last year. Weather was 3 degrees F cooler on avg, BUT last month for half that time the #$%^& pool's been running 24hrs/day instead of 9 hrs/day 'cause of all the algae/other issues I've been having. So my bill went up about $35 instead of about $125. NOT BAD....won't directly pay for the fancy system but it sure helps, and in the meantime I get other advantages....no noisy 3 ton a/c outside, got rid of the underground oil tank (YEA!!), no loss of precious living/storage space to oil storage, etc....

    Pardon the non-pool discussion, but I just can't see talk of a/c without going into it this year.... Combining full blown geothermal with pool heating would certainly be interesting....probably really effective....but probably NOT cost effective....
    Brian L
    Maryland

    35K gal 36 yr old Gunite disaster (I mean pool)

  5. Back To Top    #5

    Join Date
    Apr 2007
    Location
    Livermore, CA
    Posts
    32
    Heat pumps get really interesting when you have a 25,000 gallon water source in the backyard... Maybe in 2-3 years when I re-do our whole house AC I will look into a dual-purpose heat-pump system, or a heat recovery unit for my new AC.

    Sigh... another few summers of a hot house and a cold pool
    Darren
    ~20K gallon freeform w/attached spa
    Pentair 4x160 pump
    Pentair Mastertemp 400K BTU heater
    Intellitouch i7+3 controller
    Intellichlor IC40

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