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What Milt said...
New heaters are much more efficient than those of 10 plus years ago... same with A/C.
Making sure the house is well insulated will be your biggest cost savings with HVAC.
And have someone who knows what they are doing design the duct system... it is not DIY friendly. When I was in the biz I had to gut a few systems that homeowners tried to cobble together.
Edit to add: Is it a package unit or split system? If it is a split most if not all of the A/C efficiency in in the compressor design, that is the unit that sits outside.
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Gary Fisher 29er
2019 Kia Stinger 2.0t gone 
1995 Miata Sold
1984 944 Sold
I am not lost for I know where I am, however where I am is lost. - Winnie the poo.
Last edited by scottmandue; 11-20-2010 at 09:53 AM..
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