Things You Should Watch For
● Insist that each HVAC contractor bidding your job does a proper load calculation.
Some HVAC contractors used to size the units they installed by using a ton-per-square-foot-of-living-space ratio. That’s not good enough.
The only way to really accurately
determine the size and output requirements of your climate control system is by “Manual-J” and “Manual-H” calculations.
Buying too little output makes you uncomfortable.
Buying too much makes your net worth uncomfortable.
● Some HVAC contractors can be a wee bit extravagant in their estimating. |
There is software available that lets you do your own “Manual-J” or “Manual-H” calculations, just in case you want to compare with what the professionals estimate.
● This happened to me once. I contracted for a 3.0 ton air conditioning system. The contractor actually installed a less expensive 2.5 ton unit.
This error was discovered by noting the model number and serial number and comparing that to the records kept by the manufacturer, via website.
I made the assumption that it was an honest mistake because I had no reason to believe otherwise. But I did get them to replace the unit with what I paid for ─ a 3 ton model.
● As a contractor who must obtain his own separate permit, your HVAC specialist is responsible for requesting inspections.
As with all inspection requests handled by your subcontractors, it’s a good idea to follow up to make sure the inspections have been requested and passed.