checking system pressures is unnecessary if it is cooling well, if they were
not correct, it would not be cooling well

how is it cooling? fine? then leave the gauges alone

if you feel the need to do something, clean outside coil with lye based coil
cleaner and comb out any bent fins on both indoor and outdoor coils

modern HVAC systems are maintenance free, except for keeping the coils clean

"routine maintenance" doesn't extend the life of the system, and could
easily damage something that was not broken in the first place



"JohnH" wrote in message
...
I have a couple Lennox heat pumps I want to have checked. Aside from gas
pressure and current draw, what else would they check, or should I
specifically have them check? I regularly change the filters so they
shouldn't need to check those.

I could easily check the current draw with a clamp-on ammeter myself - how
good is current draw an indicator of a system health?

Lastly, is it really a big deal to check line pressures? Should I get a
set of gauges and Do It Myself?