6 upstairs, (1 per bdrm and 1 per bath)
4 downstairs: (kitchen, family rm, dining rm, living room)
all located just below the ceiling
only way to control the flow is the louver thing on each register
we typically close off the ones in rooms not being used, probably 1 or 2 closed anytime system is on for both heat and cool.
thanks for your help George
Okay, thank you. Sounds like all high sidewall supplies.....just like my home built in 1946. It works great for A/C. Hopefully, you don't have ductwork in the attic. It probably all comes from a main duct run through the ceiling of the main floor. Anyway, you are only moving on the supply side, with all of them open, about 1,200 cfm at .5 static.
This is not good for a 4 ton system. Did the salesmen look over the ductwork? Meaning: count the number of supplies?
I went to the website udarrell posted above and gave it a shot (I probably know just enough to be dangerous :eek:)
When I put in closest area, Los Angeles, it entered some default temps for winter and summer. To be conservative I made the summer temp 100 F and winter 30 F. I used R-11 for my stucco walls and picked average quality for ducting, etc. Anyway results I got in rounded values were:
Cooling: 33,000 btu with 30,000 btu sensible
Heating: 37,300 btu
Does that seem about right for 2000 sq ft, 2 story house?
What decides the required tonnage cooling or heating? Both come out close to 3 tons if 12,000 btu/ton is the formula. Anything else to consider?