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Payback on New HVAC

Question:

We dont "judge" the efficiency….we tell you the rating on the unit….its there.. Good point. I don’t know much about gas, but wouldn’t 60% be awfully low for a 20 year old gas fired unit ? My 20 year old oil unit is rated at 78%, and I always thought of oil as much less efficient. Bob

This is Turtle. I can remember bidding and getting a job required by General contractor the afue was to be 71% afue and nothing less. They did make lesser afue at the time. Don’t ask me what years that was. TURTLE

Response:

- Hide quoted text — Show quoted text – I have a 20 year old gas furnace and air conditioner. When calculating my payback, they use 60% efficiency for the old furnace and 6.0 seer for the old air conditioner. Without getting too technical, are those likely values for 20 year old equipment? Some of the payback comes from having a 200 watt blower on the new furnace instead of the 700 watt on the old furnace.  Does that sound right?  The brochure on the furnace (Lennox) does not address that. They figure a 7 year payback for a new 12 seer  AC and 94% furnace. thanks

Just curious. Anyone ever meet someone who could judge the efficiency of an old furnace? Besides the guy selling a new furnace.

Response:

Yes, simple, you look at the rating plates and do the math. Not that difficult! kjpro

– Hide quoted text — Show quoted text – I have a 20 year old gas furnace and air conditioner. When calculating my payback, they use 60% efficiency for the old furnace and 6.0 seer for the old air conditioner. Without getting too technical, are those likely values for 20 year old equipment? Some of the payback comes from having a 200 watt blower on the new furnace instead of the 700 watt on the old furnace.  Does that sound right?  The brochure on the furnace (Lennox) does not address that. They figure a 7 year payback for a new 12 seer  AC and 94% furnace. thanks Just curious. Anyone ever meet someone who could judge the efficiency of an old furnace? Besides the guy selling a new furnace.

Response:

– Hide quoted text — Show quoted text – I have a 20 year old gas furnace and air conditioner. When calculating my payback, they use 60% efficiency for the old furnace and 6.0 seer for the old air conditioner. Without getting too technical, are those likely values for 20 year old equipment? Some of the payback comes from having a 200 watt blower on the new furnace instead of the 700 watt on the old furnace.  Does that sound right?  The brochure on the furnace (Lennox) does not address that. They figure a 7 year payback for a new 12 seer  AC and 94% furnace. thanks Just curious. Anyone ever meet someone who could judge the efficiency of an old furnace? Besides the guy selling a new furnace.

Hi…nice to meet you… Now you have met someone that can…. Its a very easy thing to do…you read the plate that tells the rating, and then you tell the homeowner…its quite simple. The rating might not, and probably never will be as simple as "This is a X brand 80% furnace" But it is there, and its nothing but a bit of simple math….failing that, you get the model and serial and look it up. We dont "judge" the efficiency….we tell you the rating on the unit….its there..

Response:

I have a 20 year old gas furnace and air conditioner. When calculating my payback, they use 60% efficiency for the old furnace and 6.0 seer for the old air conditioner. Without getting too technical, are those likely values for 20 year old equipment? Some of the payback comes from having a 200 watt blower on the new furnace instead of the 700 watt on the old furnace.  Does that sound right?  The brochure on the furnace (Lennox) does not address that. They figure a 7 year payback for a new 12 seer  AC and 94% furnace. thanks

This is turtle. I can not tell you what your saving will be but I can give you info to try to calculate your savings. Now this would be generally speaking and to get exact yopu will have to go to some of the website that get down to the real point. First Cooling cost saving is like this. You have 6 seer and you go to a 12 seer. This is how it goes. for every seer you go up you save 10% less electrcity use. So going from a 6 seer to a 12 seer your should save about 60% less electricity to operate the equipment. This 60% is the percent of your electric use of only the cooling system and not you whole electric bill. .60 X Electric equipment use only = savings on a 6 seer going to a 12 seer. Second Heating cost of going from a 60% aflue gas furnace to a 94% aflue gas furnace will be a 34% savings of only the natural gas / fuel use of the furnace. This will be .34 X Fuel cost only of furnace = savings on a 60% aflue to a 94% aflue furnace. These are general calculations and should be take so. Do the math yourself ! TURTLE

Response:

I have a 20 year old gas furnace and air conditioner. When calculating my payback, they use 60% efficiency for the old furnace and 6.0 seer for the old air conditioner. Without getting too technical, are those likely values for 20 year old equipment? Some of the payback comes from having a 200 watt blower on the new furnace instead of the 700 watt on the old furnace.  Does that sound right?  The brochure on the furnace (Lennox) does not address that. They figure a 7 year payback for a new 12 seer  AC and 94% furnace. thanks

Response:

Dear Wade "Bozo", Just kidding….. Hello, did you read my comment on this thread? Re: electrical wiring in Well as to your question. Where about do you live??? As far as months heating vers months cooling?? Average temps hi and low??? For example the pay-off of a better cooling unit in Florida vers a better furnace in Alaska. And the difference in the price of the units. Not everybody prices the same differences in every home. Do to installation differences. or $500.00 Example : you have a 60 % now 40% ($400) going to waste, New 92% saving of 32% ($320) per year. $320 per yr at 5 yrs. = $1600.00 But at a different location may only use $500.00 a year so you’d save $160.00 per year. $160 per yr at 5 yrs. =$800.00 So, pay off would be different. Price difference between 80 ver 90 %. 10% difference figure out how many yrs. it would take to pay the difference in units. kjpro

– Hide quoted text — Show quoted text – I have a 20 year old gas furnace and air conditioner. When calculating my payback, they use 60% efficiency for the old furnace and 6.0 seer for the old air conditioner. Without getting too technical, are those likely values for 20 year old equipment? Some of the payback comes from having a 200 watt blower on the new furnace instead of the 700 watt on the old furnace.  Does that sound right?  The brochure on the furnace (Lennox) does not address that. They figure a 7 year payback for a new 12 seer  AC and 94% furnace. thanks

Response:

I have a 20 year old gas furnace and air conditioner. When calculating my payback, they use 60% efficiency for the old furnace and 6.0 seer for the old air conditioner. Without getting too technical, are those likely values for 20 year old equipment? Some of the payback comes from having a 200 watt blower on the new furnace instead of the 700 watt on the old furnace.  Does that sound right?  The brochure on the furnace (Lennox) does not address that. They figure a 7 year payback for a new 12 seer  AC and 94% furnace. thanks

Based on some recent HVAC work at my house, those sound like reasonable values. TB

Response:

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