On Thu, 15 Jun 2006 14:53:30 GMT, DK wrote:


Load Calcs are usually not necessary. Within 5 miles of me, there
are 10,000 homes built by the same 3 builders, each using 5 building
plans. Everyone in the hvac business knows exactly what size unit
these 5 plans require.

The only load calcs necessary are the 7 custom built 7 bedroom homes
that get built each year.

Do all these homes have exactly the same size units for the same
plan?
- No, of course not. Joe and his wife like to run their thermostat
at 60 degrees year around, even in 105 degree spells. Theirs is a 5
ton system while their friends have a 3 1/2 ton system.

All it takes is a brain and talking to your neighbor., not a load
calc - that will probably be inaccurate anyway.

.









Depends on the area in which you live. In a subdivision of new
construction I'd agree. The problem is that once houses get some age
on them they begin to vary. For example, there is one house in my
neighborhood like mine. It has the original windows in it, which are
probably not very efficient. It has the original siding on it as
well. Nobody has even thought to plant trees to shade it and possibly
reduce the cooling load. In about ten years my house won't need near
as much cooling as my neighbor's will.