Research name brands first. Know home square footage in order to get most energy efficient. Home and Garden will not get the most information needed.
Find the name of the manufacturer, model, and serial number of your unit. I recommend contacting a local HVAC company with this information. They will be able to contact the manufacturer to find out the efficiency. You can even call the manufacturer directly and they may be able to get you the information you seek.
HVAC unit is basically combination of HVAC chiller and all related equipment. See below related link for all details
ouside HVAC unit
I believe that a new HVAC system would be better than repairing the old one, because there are newer energy efficient models now available that would reduce utility bills.
new filter
a pencil
Model # for Lennox HVAC unit
Plug your unit into it and play it loud
Induction Unit
To condense
Because the drain is clogged.
where is reset button on outside unit of American standard hvac where is reset button on outside unit of American standard hvac