City-Data Forum In General - Heating and Cooling Cost - 1,200 SQFT vs 1,900 SQFT (square foot, price)
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06-21-2012, 02:12 PM
 108 posts, read 324,221 times Reputation: 92

In general how much of a difference is there in the heating and cooling cost between a

1,200 square foot home

and a

1,900 square foot home.

I understand that the structure and insulation does make a difference.

I am trying to find out if there is really a big difference in heating and cooling between a 1,200 square foot home and a 1,900 square foot home.

06-21-2012, 02:28 PM
Quote:
 Originally Posted by Demps In general how much... I am trying to find out if there is really a big difference...
The assumption is that if the 1200sf space requires X
the 1900SF space will require about 58% more.
All (other) things being equal... that's pretty close.

06-22-2012, 08:26 AM
 609 posts, read 1,824,784 times Reputation: 420
depends really with dual zone and all, it may not be significant. If the additional sqft is on the top level then you could keep that zone to be less hot/cold during times when not required.

06-22-2012, 11:33 AM
 Status: "October is the eighth month" (set 19 days ago) Location: Just south of Denver since 1989 10,676 posts, read 28,491,129 times Reputation: 6842
usage plays a big part of energy costs, and every home is different.

06-22-2012, 01:54 PM
 Location: East Side Milwaukee 710 posts, read 1,402,320 times Reputation: 446
I would think it would depend on if you're comparing apples to apples. Are these both detached single family homes? Also, do they have the same number of levels?

If one house is attached & the other isn't... that will make a difference. Also, I would think a 2 story house would have lower costs than a single story, there's less area for the heat/cold to escape.

06-22-2012, 01:58 PM
 Status: "October is the eighth month" (set 19 days ago) Location: Just south of Denver since 1989 10,676 posts, read 28,491,129 times Reputation: 6842
too many differentials

What if one house had no window coverings or more shade trees or a family of five or a sick person that needed a stable indoor environment?

06-22-2012, 03:41 PM
 6 posts, read 10,919 times Reputation: 17
Way way way way way way way ...

....way way way (well you get it) OFF BASE.

There is NO SUCH THING as a straightline model of converting two dimensional sq ft into THREE DIMENSIONAL space for comparisons of HVAC costs. You do not heat/cool FLOOR AREA you heat/cool AIR which fills the structure in CUBIC FEET and the calculations for how much more air there is to heat/cool are only a small part of the important questions.

Even the two homes have similar ceiling heights and room layout the correlation to how much air each has would be highly dependant on the configuration of where the air flow is directed / contained. HVAC system installers that try to "guesstimate" what the total air volume in the home are are just about sure to guess wrong and anyone building a new home or having any HVAC replaced / upgraded should demand a computerized calculation of the required system capacity. That system capacity will not, however, explain the details of what the ongoing operational costs will be.

Far more important is the relative status of the INSULATION which keeps the space at a stable temperature and the amount of weather sealing that will prevent of heated / cooled spaces from leaking air to/from the environment.

Second in importance is the relative efficiency of the HVAC equipment itself (both active and passive), its state of tune / maintenance and the kind of fuel used. Assuming "all things equal" in this regard is a BIG mistake as even equipment from the SAME manufacturer, on the same fuel source, of the same initial efficiency rating can be be far different in operation because of poor setup / maintenance. The kinds of things that even good home inspectors rarely if even check (like ductwork that leaks) can actually be responsible for MORE cost differences than the stuff that is easy to check (like improperly adjusted burner..).

Fact is I have seen MANY homeowners upgrade to larger homes of the same general quality / price class see their energy costs signficantly DECREASE simply because the bigger home was built with more awareness of the value of insulation and weather sealing. You really cannot judge how much of your money is literally going to waste because of "minimal code" type insulation and lack of advanced weathersealing techniques. Those techniques can be as SIMPLE as using TAPE on barrier layers instead of just overlapping seams!

Quote:
 Originally Posted by MrRational The assumption is that if the 1200sf space requires X the 1900SF space will require about 58% more. All (other) things being equal... that's pretty close.

06-22-2012, 04:14 PM
What part of "All (other) things being equal" ...is so difficult for you people to understand?

06-25-2012, 09:10 AM
 609 posts, read 1,824,784 times Reputation: 420
you did provide a theoretical answer to a theoretical question. Very rarely would you have two home that have "all other things" that are equal .
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