Heating /cooling system sizes for residential building
Heating /cooling system sizes for residential building
(OP)
Hi,
I am looking for ball park number for heating/cooling system sizes for a 2 story home (well insulated/E* windows)- approx 1500 sf located in MA. I aprreciate any help/suggestions..
thanks..
I am looking for ball park number for heating/cooling system sizes for a 2 story home (well insulated/E* windows)- approx 1500 sf located in MA. I aprreciate any help/suggestions..
thanks..





RE: Heating /cooling system sizes for residential building
"M1401.3 Sizing. Heating and cooling equipment shall be sized based on building loads calculated in accordance with ACCA Manual J or other approved heating and cooling calculation methodologies."
You may want to Google this and see if you can find trial versions of Manual J software.
Don Phillips
http://worthingtonengineering.com
RE: Heating /cooling system sizes for residential building
I was looking for the range.. something like kBtu/hr/ft2 or Tons/sf...general numbers not specific..
RE: Heating /cooling system sizes for residential building
Well insulated and shaded...maybe 400.
Best to run the J calculations.
Ken
KE5DFR
RE: Heating /cooling system sizes for residential building
In Southern California, even a 3-ton A/C for 2000 sqft might be a bit much, since the air is so dry. But, you have to put up with relatively long run cycles, compared to running a 4-ton A/C in the same house. For power efficiency, you want longer run cycles, but for faster cooling or more drying, you might want the higher tonnage.
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RE: Heating /cooling system sizes for residential building
Don Phillips
http://worthingtonengineering.com
RE: Heating /cooling system sizes for residential building
As stated, it is best to run the load calc's for accurate estimates of capacities required.
Andy W.
RE: Heating /cooling system sizes for residential building
RE: Heating /cooling system sizes for residential building
thanks..
MSB
RE: Heating /cooling system sizes for residential building
Don Phillips
http://worthingtonengineering.com
RE: Heating /cooling system sizes for residential building
IRstuff: You get better humidity control from longer running cycles. This is why it is bad to oversize units - when a unit is oversized, it will cool the space in too short a period of time to remove the moisture.
MSB: That's why we run the numbers. With good insulation and glass, it's not unusual to get low-sounding numbers anymore - even here in FL where I am. That's one reason I didn't pipe-in earlier with a btuh/SF number/range.
RE: Heating /cooling system sizes for residential building
I have an 1800 SF house in teh mid-atlantic area. 1958 vintgae, double pane windows. split level home.
I have a 2-1/2 ton AC unit - that's 720 SF per ton.
I set the stat at 72F in the middle of summer, the unit still cycles.
As Pat says, do not oversize or else you will have that damp feeling in the basement. Let teh compressor work all day to dehumidify proerly.
With today's energy efficiency and all (assumming a regular house) - a 2-ton unit (750SF/ton) is a good rule of thumb you are looking for.
You still need the Manual J.
RE: Heating /cooling system sizes for residential building
Jabba
RE: Heating /cooling system sizes for residential building
RE: Heating /cooling system sizes for residential building
Jabba