dad211

load calculations are different for basements, due to the fact of most of the exterior walls being underground less windowsurface area and less doors. I was in the heating and air trades for 16yrs and have worked for many a contractors that use "rules of thumb" to me its a dangerous practice. most salesmen in the industry for residential units use 500sqft/ton to size for replacements instead of just taking a couple hundred bucks and a half hour to perform a true load calcs.

in my opinion spend it now to replace both then you have a good warranty and a more efficient product and it will cost you less now then later, what happens in a week or so when the heat exchanger cracks or the board controling it shorts out or the gas valve malfunctions jsut my opinion tho.lil more now or alot more later plus having to inconvienence the tenant by fixing it twice all thing that should be considered and make sure the work is done by a licensed professional that will show you a load calculation he/she has performed on the property to correctly size the unit and ask if it will be installed by certified techs such as NATE or ACCA Excellence like any investment you only reep what you sow