Diagnose before quoting
The fault decides the price, not the season.
A dead unit, a hot house, and a quote for a replacement before anyone diagnosed the fault.
The pressure in this trade runs one way. A system fails in the worst week of the year, the house is unbearable, and a replacement quote arrives before anybody has established what actually broke. A surprising share of those failures are a capacitor, a contactor or a condensate drain — hundreds of dollars rather than thousands.
Where replacement is right, sizing is the decision that matters and the one most often skipped. Matching the tonnage of the outgoing unit copies a calculation nobody has checked in twenty years, and oversizing produces a house that is cold and humid because the system never runs long enough to dehumidify.
And before anyone sells a bigger system for the bedroom that will not cool, the ducts deserve testing. Leaking attic ductwork sends conditioned air into the attic, and no amount of extra capacity fixes a delivery problem — it just raises the bill while the room stays warm.
The fault decides the price, not the season.
Matching the old unit is not sizing.
Ratings are test conditions, not bills.
Free, including an honest answer about repairing instead.