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Posted by on July 11, 2006, 6:56 pm
Noon-Air wrote:
> >
> >>
> >>> When getting a new HVAC installed, how do you know you are getting the
> >>> correct size for your home?
> >>>
> >>
> >>Run a heat load on the house. There isn't a 'rule of thumb' that works.
> >>
> >>There are a bunch of programs available on the internet.
> >>
> >
> > Indeed. lets look at how long its taken bill gates to write a program
> > that isnt full of bugs and doesnt crash.
> >
> > Ok now suppose we have a rock solid, building-code-approved load
> > calculation program. 10 different people, inputting data
> > independently, will arrive at 10 different 'answers'. Which one is
> > most correct???
>
> Take the highest, and lowest and trash them... the rest should be pretty
> close.... go with the averages.
>
> > OK now we have the exact btu gain/loss numbers, and now we must
> > select pieces of equipment that most closely matches the heat
> > gain/loss numbers, and still stay within the customers budget.....
>
> For the most part this is true.... there are also a lot of financing options
> avalable.
>
> > Guess what?? NOBODY makes a 29,000 btu gas furnace with a 57,295
> > btu, 5 ton blower, which is exactly what the load calc says is
> > needed..........so now what? Oversize the heating to obtain the
> > desired cooling airflow??
>
> This is going to to be dependant on the region, and the design perameters.
>
> > A tiny fact that most consumers are never made aware of is that a
> > heating or cooling load calc is accurate at only one point in time,
> > and that is when indoor and outdoor ambient temps are at DESIGN
> > conditions. Any other time its either oversized or undersized.
>
> There are multi-stage furnaces, and air conditioners available.
How does HVAC size effect its energy efficiency?
The region is Washington DC
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