Clients need a correctly sized system — not oversized — that dehumidifies properly and operates efficiently without short-cycling.
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What clients expect and what professionals need to know
Central AC installation involves sizing the system using Manual J load calculation, installing the outdoor condenser on a pad or wall bracket, connecting refrigerant lineset (typically 3/8 and 3/4-inch copper tubing), installing the air handler or evaporator coil above the furnace, and pulling a vacuum on the refrigerant circuit before charging with R-410A or R-32 refrigerant to manufacturer specifications. Electrical work includes a dedicated 240V circuit and outdoor disconnect.
Clients need a correctly sized system — not oversized — that dehumidifies properly and operates efficiently without short-cycling.
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Common questions from clients looking for Central AC Installation services
Minimum federal standards are 14–15 SEER depending on region; 16–18 SEER offers meaningful efficiency improvement; 20+ SEER units have long payback periods except in extreme climates.
Proper sizing uses Manual J load calculation accounting for square footage, insulation levels, window area, climate zone, and orientation — rule-of-thumb "1 ton per 600 sq ft" leads to oversizing.
Oversized systems short-cycle — they cool quickly but don't run long enough to remove humidity, leaving the space clammy and causing temperature swings.
A straightforward replacement of an existing system takes 4–8 hours; new installation in a home without existing ductwork adds 2–5 days for duct installation.
Quality central AC systems last 15–20 years with annual maintenance; compressor failure is the most common end-of-life failure mode.
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Practical reading for locals building up their client list.
