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Old 02-23-2012, 07:16 AM   #1
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Eco audit heat loss


Anyone know how accurate is the
ECO energy audit heat loss
calculation?

My numbers from ECO are 48676 BTU for heat
and 23878 BTU (2 ton) for cooling.

House is 2000 sq.ft (basement+900sq.ft.)., two
storey, R17 walls and R50 attic, near London ontario

I tried a few on-line heat loss calculations and got
very close 51715 BTU and 52074 BTU.

The original install was 11 years ago they installed
a 70000 BTU furnace and 2.5 ton A/C

Anybody ever have issues with the ECO numbers?

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Old 02-23-2012, 07:52 AM   #2
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Eco audit heat loss


if u r asking for just an off the top of the head opinion I would say it's a little light. I live near enough to London to have pretty much the same winter temps.

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Old 02-23-2012, 03:53 PM   #3
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Eco audit heat loss


Could be that in the brand they installed, there is no 60,000 BTU input, so they had to go to a 70,000.

I would think the 2 tons of A/C load is probably fairly accurate. However, would need to know what the sensible and latent gain was, not just the total.
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Old 02-26-2012, 09:20 AM   #4
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Eco audit heat loss


Just did another government calculation and got furnace size of 49000 BTU.

This was using actual gas consumption and degree days. I believe 60000 furnace is best.

I was given quotes on 80000 two stage but makes no sense because will never go to high.
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Old 02-26-2012, 11:31 AM   #5
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Eco audit heat loss


if it only uses degree days, then its not very accurate.
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Old 02-26-2012, 12:50 PM   #6
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Eco audit heat loss


Why do you say it is not accurate?

I said they used gas consumption and degree days for same period.

The calculation was part of CMHC government research study involving 26 houses. The findings were verified using manual j and other software. All 3 methods were consistent with each other. They concluded most furnace installations are grossly oversized.
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Old 02-26-2012, 01:04 PM   #7
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Eco audit heat loss


Degree days doesn't account for night time conditions.

At 20 degrees outdoor temp at 2:00PM, a home needs less heat then at 2:00AM at 20 degrees outdoor temp.

Degree days is an average, so its not accurate for determining heat loos, or gain.
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Old 02-26-2012, 10:04 PM   #8
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Eco audit heat loss


Using HVAC-Calc I got the following:

Sensible Gain = 17688
Latent Gain = 2220
Heat Gain = 19908 BTUH

Heat Loss 43778 BTUH

I will be replacing it with 60K furnace and 2 Ton A/C unit.


Last edited by wing 851; 02-26-2012 at 10:53 PM.
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