Quotes for ICF House in Florida

hpxmirageMarch 24, 2011

New house build, ICF block, approx 3000sf, with two guest bedrooms and in-between bath on a second story. Includes master bedroom and flanking master baths below guestrooms upstairs, plus large family room opening to screened porch, lakeside (humidity a significant concern, hence both quotes reflect two speed compressors and VS air handlers). Kitchen, small butler's pantry, dining room, two offices, small workshop, laundry room and central hallway bi-secting home from garage and front door entrance to far end/family room & porch. Electrical and plumbing already in place.

Both quotes include installation of three Fantech PB-270H dual grill exhaust fans and two PB-110 exhaust fans, as well as attic-mounted 1266cfm range hood exhaust fan and silencer on infinitely variable switch at hood. Cost of fans about $1600, not including Fantech recommended mounting hardware and timer switches for all bath and workshop fans, but all part of quote. All to be installed per manufacturer's guidelines, incl. insulated ducting. Manual J calcs conducted for heat pump system.

Upstairs:

Bryant Evolution Two Speed 286BNA02400

Infinity Variable Speed FE4ANF002T00

1st floor Master BR and baths, entire 2d floor. Infinity controller for main thermostat (MBR) and Edge Pro for 2d floor zone.

Downstairs:

Bryant Evolution Two Speed 226ANA036000

Performance Variable Speed FV4CNF005T00

Outside air will be ducted from exterior and controlled by a barometric bypass damper to mix with ducted return air to unit. Carrier Edge Pro Thermostat located in first floor common area.

Both systems include MERV 11 filter cabinet adnd filter located below air handler at return intake.

$19,900

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Second quote.

Upstairs and MBR/baths downstairs.

Carrier Infinity 25HNA924 2 ton, 17.9 SEER, 8.5 HSPF, 5K Aux heat

Carrier Infinity FE4ANF002 VS AH

Thermostat SYSTXCCUID01

Downstairs main house.

Carrier Infinity 25HNA948 4 ton, 164. SEER, 9.8 HSPF, 5 K Aux heat

Carrier Infinity FE4ANF005 VS AH

Thermostat SYSTXCCUID01

Same fan installations as first quote, including all ducting.

$21,500

Look forward to some of our resident professionals weighing in on this expensive (but challenging) system. Thanks very much.

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baldloonie

www.energywisestructures.com

They know how to size equipment in tight homes and guarantee utility bills. 5 tons seems high for something that well built but only an accurate calc will tell. I wonder how many know how to size for ICF and foamed homes. Or are scared to put small equipment in.

    Bookmark   March 25, 2011 at 5:53PM
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udarrell

Those Insulated Concrete Form (ICF) homes are usually very energy efficient; I doubt it would require that much tonnage to effectively cool your home.

If rebar re-enforced, should withstand hurricanes & tornadoes.

Were I to live in OKC, I'd sure like to have one with total shell rebar re-enforced insulated concrete!

I agree with Baldloonie...

Here is a link that might be useful: A/C System & Duct System Sizing

    Bookmark   March 25, 2011 at 7:49PM
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hpxmirage

Thanks for the feedback.

First quote is supposed to reflect a 3 ton unit for the downstairs, and the 2 ton upstairs for the two upstairs guest rooms and bath, master bedroom and two master baths on the first floor below them.

The downstairs unit from the second quote is supposed to be a four ton, not five.

Based on what I've learned over the last few months, given the unique humidity challenges that extremely tight, energy efficient houses pose, I'd rather err on the side of slightly less than slightly more tonnage than cause short-cycling of too big a unit, and the attendant stale, humid air.

And yes, the ICF blocks are hell for stout - ours will withstand winds of 184 mph. Having lived through Charlie and three other hurricanes in 2004, I have a particular appreciation for that quality. :-)

    Bookmark   March 25, 2011 at 11:20PM
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