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Old 07-23-2010, 05:19 PM   #1
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new furnace install

HI. I have a 53 yr. old home.ranch style,2100sq.ft. i recentley converted to gas. i am in the market to replace my oil fired furnace,with a new gas unit. I also have a 3.5 ton a/c unit. I have been talking to contractors in my area,and i have been getting different opions on this job.i am being told to use a high eff. unit. two stage,variable speed. i also have been told to use an 80 or 90% unit. My supplys to each room are all 4inch and the one contractor said that with the 4inch supplys the variable speed would be loud. i have a total of 18 supplys in the house. does anyone have any ideas on this matter. The a/c unit is also working with the same duct system.


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Old 07-23-2010, 05:47 PM   #2
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If the furnace is sized properly. A VS blower won't be loud.


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Old 07-23-2010, 07:18 PM   #3
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If you live in the US and pay taxes the 95% AFUE is going to get you a huge tax credit,30% of the cost up to $1500. It's also goingto save $150-$200 a year in fuel vs the 80% for the next 20+ years. The cost difference is many times less then the savings.
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Old 07-23-2010, 07:37 PM   #4
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Beware of the cost issue. The high end units (deluxe models) of the higher end brands like Lennox, Trane etc have more deluxe circuit boards with more dip switches and more specific ability to set their VS blowers over a larger range. The cheaper units have VERY basic adjustments. That can be a issue for you as if there is no adjustability then the contractor cannot fine tune it as well. You get what you pay for.

Do you own heat loss and load calculation to make sure you get the right sized furnace.Load Calculator
"Cut it twice and it is still too short".
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