Bryant 60,000 BTU or 80,000 "preferred 359 BAV" 95% furnace?

Old 10-07-09, 02:22 PM
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Bryant 60,000 BTU or 80,000 "preferred 359 BAV" 95% furnace?

I am replacing a 1985 Day and Night 356B 90,000 BTU 80% furnace with a 4 ton blower connected to a 3 ton a/c unit. Heating about 2500 sq. feet 2 story, When we have houseguests we open the heat vents in another 330 sq. ft. room. We generally don,t heat and cool that room and keep the 2 vents closed and sealed. We seldom use the a/c (about 6 times a year) so we are only replacing the furnace.
Bryant guy says 80,000 Btu with 2 stage furnace and Carrier says 60,000 Btu in his equivalent model.

Also is a 2 stage stat like the Honeywell Visionpro th8320u1008 with 3h/2c. appropriate for this furnace? Thx, Orygun Jim
Old 10-07-09, 02:44 PM
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90,000 x 80% = 72,000
80,000 x 95% = 76,000
60,000 x 95% = 57,000

60 sure seems small. Have you upgraded your windows and insulation?

The Visionpro TH8321 is a great stat, I have one on my house.
The Bryant Evolution and Carrier Infinity stats are much better.
They can communicate any problems directly to your stat.

This was a little shaky, too much coffee...

Inifinity heat video by Houston204 - Photobucket
Old 10-07-09, 05:55 PM
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Furnace size

I suggest starting with your own heat loss calculation. Here's one I've used & been very happy with. HVAC Software, HVAC-Calc for Heat Loss, Heat Load Calculations

It costs about $50 but it's the best $50 you can spend on the project.

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