On Tuesday, January 27, 2015 at 5:35:42 PM UTC-5, Ed Pawlowski wrote:
On 1/27/2015 4:52 PM, Pico Rico wrote:
A friend has a house in the mountains. No A.C. The furnace is as old as
the house, probably 1965 or 1970. Are new furnaces more efficient in their
use of natural gas, and thus "pay for themselves"? If so, how does one
calculate the anticipated savings and pay back period?




Older furnaces can be from 50% to 70% efficient while newer ones are
over 90%. If you replace a 70% with a 98% you save roughly 28% of your
fuel costs.

A few years ago I replaced my boiler and save nearly 40% on fuel costs
and it is enough to pay for the cost over about 7 years. There may be
rebates available or special financing so be sure to check it out.


I saw similar when I replaced my 27 year old nat gas furnace with a 93%.