Repair · Phoenix

Thermostat Replacement in Phoenix — July 2025

CompletedJuly 15, 2025

TechnicianGarrett

Service AreaPhoenix

Visit Invoice Total$551.10

Call (602) 613-3489

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Reported by the Homeowner

The thermostat says it is starting but seems stuck and the system isn’t turning on.

Phoenix homeowner · July 15, 2025

The Report

What the homeowner told us

The thermostat says it is starting but seems stuck and the system isn’t turning on.

Findings & Work Performed

What Garrett documented during the visit

Failed thermostat; condensate drain line clogged.

Replaced thermostat with an Ecobee smart thermostat; flushed and cleared a clogged condensate drain line using a Gallo gun and water.

The Verification

Verification performed

Thermostat operation tested in both heating and cooling modes.

— Related Services

How this repair fits into our Phoenix HVAC service

This repair is one example of the Thermostats work AZ Perfect Comfort performs across Phoenix, AZ. You can browse every case study we have published for this type of work in the Thermostat Replacement case studies archive. Homeowners who join our Comfort Club maintenance membership get every eligible repair backed by our Lifetime Repair Guarantee. For larger repairs and replacements, financing options are available for qualifying projects.

— Parts & Work Performed

Exactly what was installed

Description	Qty	Price
Remove existing thermostat and install a new Ecobee 3 smart Wi‑Fi programmable thermostat. Test system operations and ensure app connectivity. Does not include sensor.	1	$257.60
Trip charge to travel to customer home. Waived with paid repair during normal business hours.	1	$49.98
Trip charge waived with performed and paid repair or service (Mon–Fri 7am–5pm).	1	$-49.98
Clear the condensate drain line. Clean and flush pipe to ensure proper draining during heating or cooling cycles.	1	$266.00
Perfect Comfort Club membership: two maintenance visits per year and listed member benefits.	1	$27.50

Total: $551.10

— Photo Documentation

22 photos from this repair

Every step of this repair was documented on-site by Garrett.

Thermostat wall plate removed, showing low-voltage control wires connected to labeled terminals and an open wall cavity.

Thermostat base removed from wall showing terminal strip with connected control wires and wall opening behind.

Diagnostic instrument display shows 88.7 °F.

Thermostat wall base with multiple color-coded control wires connected to labeled terminals.

Wall-mounted touchscreen thermostat powers on, showing a startup message on the display against a textured wall.

Diagnostic instrument display shows 96.4 °F.

Wall-mounted digital thermostat powers on, showing a welcome screen with the word hi on its display.

Wall-mounted touchscreen thermostat displays a startup screen with the message 'Starting... Please wait...' on its display.

Condensate safety float switch on PVC drain tee with two low-voltage leads near the air handler.

PVC tee on a small drain line with dark sludge visible inside the opening.

Small PVC elbow drain outlet on exterior wall, with wet stones directly below the opening.

PVC drain tee with open cleanout port showing dark standing liquid inside the fitting.

Horizontal furnace in attic with connected ductwork, surface debris on cabinet, loose wiring, and tools on the floor nearby.

Diagnostic instrument display shows 73.1 °F.

Diagnostic instrument display shows 56.4 °F.

Attic furnace with sheet-metal plenum, insulated flex ducts, PVC condensate drain, and sealed joints visible around the cabinet connections.

PVC condensate drain with P-trap and cleanout beside air handler, with dark moisture staining on subfloor.

Water flows from an upper PVC condensate drain outlet into a lower PVC pipe beneath an HVAC unit.

Wall-mounted smart thermostat shows cooling mode active, screen displaying 74 and 39% humidity on a textured wall.

Hand holds a drain line cleaning tool at the PVC condensate piping below the air handler, with a float switch and wet floor.

Open PVC drain cleanout shows water at the pipe opening.

Condensate drain connections beneath the air handler, showing PVC piping, purple primer on fittings, and an inline float safety switch.

— Frequently Asked

Questions about this repair

What was documented about the thermostat or controls?

Failed thermostat; condensate drain line clogged.

Does AZ Perfect Comfort service Phoenix?

Yes. AZ Perfect Comfort services Phoenix and the greater Phoenix Metro area. Call (602) 613-3489 to schedule.

Are these repairs guaranteed?

AZ Perfect Comfort Diamond Members receive our Lifetime Repair Guarantee — if the same failure returns, the repair is on us. All other repairs are covered by our standard workmanship warranty. Ask your technician about becoming a Diamond Member to unlock the lifetime guarantee.

— Same Problem At Your Home?

Let's get your home feeling "just right" again.

AZ Perfect Comfort has served Phoenix and greater Phoenix with same-day HVAC diagnostics and repair. Diamond Members get every repair backed by our Lifetime Repair Guarantee.