Results 92 to 97 of 97
10-25-2012, 10:24 PM #92
May still go for the 3.5 ton 15 SEER based on ROI analysis. Also, this contractor's Manual J, which I provided all the data for over the phone, came up with a 44000 BTU cooling load. That's 8000 BTU higher than the lowest of the 3 other Man J's provided by contractors, and about 12000 BTU higher than the Man J that I did online.
Dealer will install a 3 ton if I'm willing to risk it, but ONLY if I agree to a "hold blameless" clause in the contract in case it doesn't hold setpoint in the hot summer months.
Based on avg cooling costs shown on the AHRI site for the models quoted, and the calculations at www.hvacopcost.com, there'd be almost no power cost savings advantage in a 4 ton variable compressor over a 3.5 ton single speed compressor in my house. There's a slight savings advantage in a 3 ton variable speed over a 3.5 ton single speed, maybe $200 a year, at most.
10-25-2012, 10:35 PM #93Regular Guest
- Join Date
- Jun 2001
- Oklahoma City
What is the power cost savings by going to a 3 ton single speed? Even if it didn't hold setpoint during the hottest afternoons, it would quickly catch up after the sun went down. My house is 200sqft smaller than yours but I have 3 more people. Design temps are close, it's 96 for OKC. My 2 ton 14SEER unit keeps it 75 inside on a 100 degree day...
10-25-2012, 11:11 PM #94
10-25-2012, 11:22 PM #95
10-26-2012, 12:16 AM #96
Joy, cycling equipment will cost significantly more than non cycling equipment. Your home is not a laboratory, load changes and cycling depends on how oversized equipment is to load. Balance, noise and comfort are impacted as well. You know this stuff, where's this brainfart coming from? Someone selling fear?
"boy, that's a huge scoop of ice cream". Pan back, and you see a mountain of snow behind you.
"huge" when unmeasured tends to grow to disproportionate levels.
And if it's your neighbor with 8 kids, people intuitively recognize variations in usage and account for them when comparing.
Without having use transparency you don't get to results transparency. And thats a critical quality metric EE really needs for credibility.Which makes more sense to you?
CONSERVATION - turning your thermostat back and being uncomfortable. Maybe saving 5-10%
ENERGY EFFICIENCY - leaving your thermostat where everyone is comfortable. Saving 30-70%
DO THE NUMBERS! Step on a HOMESCALE.
What is comfort? Well, it AIN'T just TEMPERATURE!
Energy Obese? An audit is the next step - go to BPI.org, or RESNET, and find an auditor near you.
10-26-2012, 07:14 AM #97
Is this a modular home, double wide, or a stick built?