I don’t know what type of “professionals” you deal with but oversizing to any extent is dumb it creates all kinds of problems trying to tune or balance the system. Why would I create my customer and myself a problem that sometimes is not solvable?
When I estimated a job I did a manual J to home in on the heat loss and heat gain of the envelope. This required measuring the size of the house, the size of the window the direction they faced and the e value of the units, the value of the insulation in the walls and ceiling, overhang, amount of exposed basement wall or slab to name a few factors.
Manual J is a computer program that if given all the necessary inputs accurately will spell out the size of the heating and cooling units. In the new high efficiency units offering a rebate this is a prerequisite to obtain the rebate.
It is my experience it is the HO that usually oversize’s the unit and then call the professional the first really cold night and the High Limit is tripping because the duct work is undersized for the BTU output of the furnace sorry but I have a lot of years in that trade and I could not disagree with you more.
Let me also admit that there are all kinds of professionals some are good and honest, some are hacks and screw up because they don’t know any better, and then occasionally you run into a real crook often these are the guys that offer a $19.99 tune up, now I don’t care where you are no one can set a service truck in your driveway for $19.99 they will have to find some “big problems” and tack on some big charges to make any money on the call.
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