Your AC system’s power, or tonnage — measured in British thermal units (Btu) — will affect the cost of replacement evaporator ...

California may require homeowners to replace their broken air conditioning units with heat pumps or ... Heat pumps are nearly identical to central air conditioners but use a reversing valve ...

Here’s how BTUs and tonnage relate to price for central air conditioners, which typically start at around 1.5 tons. In addition to buying the AC unit, you’ll need to pay for installation.