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Posted by John Smith on July 17, 2006, 10:18 pm
> Ohh! Eww! Eww! $25,000! Wow!
> Get a grip buddie. $25,000. Whoopie ting.
> I turned down a $28,000 job two weeks ago.
> Id estimate that Id probably charge someone like you over $100,000 for
> your job. You know.....asshole fee and all.
> Bubba
>
>
>>Let me add that this will be a contracted system with a budgeted number
>>over
>>25k, in Ohio, where installation of a conventional, high-quality
>>forced-air
>>system goes approx. 8-10k.
>>
>>In the questions below, I'm trying to determine if manual J alone works
>>for
>>the type of home being built, and if some contractors who have experience
>>actually installing this type of system can comment on their preferences
>>of
>>general equipment types - not specific brands or model - to aid us in
>>evaluating the bids we receive.
>>
>>> I have a few questions for those in the trade:
>>>
>>> 1: Does the current Manual J 8th edition include considerations,
>>> calculations, and/or values for the infiltration tightness of an ICF
>>> building envelope? Does it utilize both u-factor and shgc for windows?
>>>
>>> If so, can it be adjusted to address passive solar gain for structures
>>> designed with proper southern orientation and overhangs?
>>>
>>> The windows and doors for the home have Energy star rated u-factor and
>>shgc,
>>> but the shgc is being spec'd high for thermal gain in the winter, with
>>> the
>>> windows shaded by building overhangs in the summer ( northern climate
>>zone).
>>>
>>> I only received one of several bids requested so far, and the contractor
>>> said he did the load calculations per manual J. But he sort of
>>> tap-danced
>>> around specific questions about the calculations, and the unit size/btu
>>> rating seems to me to fit a "sq.ftg./8" sizing, as opposed to an
>>> accurate
>>> calculation based on r-22 ICF walls and r-40 ceilings combined with
>>> geothermal and radiant/gyp. floors.
>>>
>>> 2. I've identified the WaterFurnace brand gshp's as the most efficient,
>>and
>>> have requested the bids accordingly. This contractor spec'd a Synergy3
>>> unit with radiant /forced air htg/ac with a 15kw boiler. When I asked
>>> him
>>> about why the Synergy instead of a reversible EW unit, he said forced
>>> that
>>> water coil ac air-handlers were hard to find and the boiler was for
>>backup.
>>> I'm not sure how the boiler is backup, since its an all electric
>>> home.........
>>>
>>> I'm hoping that the other contractors bidding will be more specific/
>>> forthcoming with information on how they arrived at their specs, but in
>>the
>>> meantime,
>>>
>>> Can those with experience of combining geothermal / radiant / ac / ERV
>>> comment on their approach and equipment choices?
>>>
>>> Thanks in advance.
>>>
>>>
>>
You can have 3 mechanical engineers figure the calculations and have 3
different answers. You really need do some searching and find someone who
can help you, start with the manufacturer's of the equipment you want
installed, they should be able to point you in the right direction.
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