Henderson, Nevada
The whole city is covered. Green Valley is part of Henderson rather than a town of its own: the city's fact sheet counts the Green Valley library and Green Valley High School among Henderson facilities (city fact sheet), and permits there go through the city.

ZIP codes
Most Henderson addresses fall in the ZIP codes below. 89044 reaches past the city line to the south.
Show the ZIP list
Henderson: 89002, 89011, 89012, 89014, 89015, 89052, 89054, 89074, 89044. Boulder City: 89005. Paradise: 89119, 89120, 89121, 89123, 89169. Whitney: 89122. Enterprise: 89139, 89141, 89178, 89183.
Referral notice
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Talk it through with an HVAC contractor
Say what the equipment is doing and how old it is. An independent contractor who works in Henderson, Nevada takes it from there.