Interpreting HVAC-CALC Results
I am converting my garage into a family room. Trying to figure out whether I can tap into my existing central air or if I need to go with a ductless mini-split.
Did a HVAC-CALC tonight.
Existing: 10,000 Gain, 29,000 Loss
Garage: 6,500 Gain, 13,500 Loss
Total: 16,500 Gain, 42,500 Loss
I have a 1.5 ton 10 SEER A/C, and a 40,000 BTU furnace.
So I am close. But is it too close? Any advice?
1.5 ton is 18000 btu's of cooling so if you did your numbers right then it looks good. Although mini splits are nice too.
Depending on the match between the indoor and outdoor unit you may not be getting close to 18000 BTU's. You would need to find out by posting indoor and outdoor model numbers and see if we could tell you. Is your furnace 80%, 90%? I woud say you are really close but it may work.
Its a good Life!
Is that total gain, or sensible gain.
12.5K Sensible + 4K Latent = 16.5 Total
Originally Posted by beenthere
If your OD design is 95, and you did your ID design at 70.
The average 1.5 ton won't have a 12,500 BTU sensible capacity.
So on those 95 degree days it would lose temp a little.
In addition to the possibly undersized AC, if your furnace is 80% efficient, you only have 32,000 btu of output, at best.
Armstrong Concept 10
Originally Posted by m kilgore
Contractor told me the 18 in the model # means 1.5 ton. Can someone verify that.
Armstrong Ultra II 97
Furnance clearly says 40K BTU.
Thanks for your help,
Its a nominal 1.5 ton A/C.
Weather its true capacity is 18,000 BTU's or not, that I can't tell you.
Your furnace output won't be 40k btu, as Mark said.
Was the wall between the home and the garage ,treated as an inside wall in both calculations??
Originally Posted by wrldruler
If not the load would be reduced.
I ignored the wall between the garage house. It was not in the calc. Thanks
Originally Posted by dash
Put the mini split in the garage.
Yes the 18 in the serial means 1.5 ton. Total capacity sensible and latent. I doubt it has 18k sensible capacity.
All-American Air Conditioning
Vero Beach, Florida