Do you know a road to subtract the hoard when comparing steam pumps? I've heard heat pumps usually closing about 15-20 years and mine is...

I've heard heat pumps usually closing about 15-20 years and mine is now 16 years feeble, but running fine. In an attempt to be proactive and environmentally conscious, is there a way to determine if upgrading to a newer element would be a wise investment? Would it lower my utility bills enough to support upgrading?
Answers:    You can do some close estimating of savings by comparing the power consumption in amperes per btu of your element to the same figures for a trial one.
However, the short answer (and probably correct) is that you can't possibly save enough by varying units to come out ahead in dollars spent for the subsequent umpteen years. When you face spending money to repair you old component will be the economically sound time to figure cost hoard of a new unit.
A/C is rate in SEER units. The complex the SEER the more efficient the unit. A glorious SEER unit will lower your electric bill.

Check this link:
http://en.wikipedia.org/wiki/Seasonal_en...