The math is not quite there

I disagree – the math is right on. Maybe you mean to say there are more variables that I didn’t take in to account?

you use the # .90 cents a therm but what about the .18 cents a therm that you get charged for distribution cost

My distribution costs have been factored in to the equation. Check out this shot of a recent bill – my ‘Cost of gas’ for this billing cycle was $0.34391 per therm, plus $0.13679 for the ‘Delivery Charge’. My total cost per therm for this billing cycle was $0.48552 per therm, but this was a particularly low bill. Some are much higher… and they all average out to $.90 per therm.

that is a hard cost to you

Again, it’s factored in.

also the furnace does only last 15 to 20 years in a home the picture that you show is not a new furnace so for safty you would replace that furnace.

Why would I replace this furnace for safety? It’s safe the way it is.

The cost of a 80% is about 3000.00 installed

According to who? I was quoted $2,050 for an Armstrong 80,000 btu furnace, including installation costs.

making the diference only $1000.00 to $1500.00 differnce

Not so – the difference would be what I put in my blog.

if you get the tax credit of $1200.00 back and add in a $225.00 rebate form Xcell enery and at least a $200.00 MFG rebate you would be giving away $500.00 in personal $ and overp[aying the utility company an exrta 16% every month even on your small bill that is $74.88 every year and for 20 years is $1497.60

Huh? I’m not pickin’ up what you’re layin’ down.

not to mention that the furnace does run on elecrticty and a standard motor like the one you have in your old furnace uses the equivelent of 500 to 615 watts of power every hour and the new high efficency furnaces use the equivelent of 87 watts per hour.

I’m not using my old furnace as a comparison. New 80% efficient furnaces will have the same type of variable speed fans that high efficiency furnaces have. You’re comparing apples to oranges.

A properly size furnace fan will run over 3000 hours a year in cooling and heating if you run your fan to circ air it is even more that is 1200 KW per year and at .11 cents a kw that is an additional 132.00 a year extra x 20years is $2640.00 in utility over payment.

Again, you’re comparing apples to oranges. New 80% efficient furnaces have newer variable speed fans.

I am trying to understand your math but you might be steering people to make a costly discion If I total up the real cost it would cost you over $5762.26 to not upgrade the 1000.00 to the 95% eff furnace. i did not even get into the multi stage savings so it would be even higher.

If I were comparing a new high-efficiency furnace to an 80% efficient furnace with an old single-stage blower fan that costs $3000, sure… but that’s not the case.

i did not even get into the multi stage savings so it would be even higher.

80% efficient furnaces are also available in multi-stage.