15+ years • 6,500+ jobs completed • 1,500+ Oklahoma homes served
Straightforward pricing
- $99 dispatch on every truck roll. Free on new-install estimates.
- $210 flat residential service call: $99 dispatch plus $111 diagnostic. The diagnostic does not reduce the repair price.
- Written repair estimate: I give you a written repair estimate before repair work starts.
- Free estimates on new installs. No charge to walk through replacement options.
Call (405) 375-4822. 4.8 stars, 300+ Google reviews.
Thermostat Installation & Replacement, Oklahoma
★ 4.8 Stars / 300+ Reviews | 45 Yrs Experience | NATE Certified | Kingfisher, OK
Hartzell’s is booked weeks out during peak season. Call 405-375-4822 now to lock in your spot, same-day often available for urgent issues. Or use the chat button in the corner.
A thermostat is a small part with a big job. I see a lot of systems that aren’t running right because of a misconfigured or failing thermostat, not a bad compressor. We install and program all major brands, handle C-wire adapter installations, and make sure your thermostat is matched to your specific system.
Thermostat Brands We Install
Honeywell Home
Pro Series, T6 Pro, Vision Pro 8000. Most widely installed brand in central Oklahoma.
Ecobee
SmartThermostat with voice control. Room sensors for multi-zone comfort.
Google Nest
Nest Learning and Nest Thermostat E. Auto-schedule, remote access.
Sensi
Emerson Sensi Touch. Clean interface, app control, works with older systems.
Emerson 1F
White Rodgers line. Budget-friendly, reliable, programmable and non-programmable.
Trane ComfortLink
Communicating thermostat for Trane systems. Full system diagnostics.
Carrier Infinity
Communicating control for Carrier systems. Humidity control, IAQ integration.
Non-Smart / Basic
Basic 5-2 day programmable and non-programmable thermostats available.
Thermostat Services
- Smart thermostat installation and programming
- Thermostat replacement (old for new)
- C-wire (common wire) adapter installation for smart thermostats
- Wiring diagnosis and repair
- Communicating thermostat setup (Trane, Carrier, Mitsubishi)
- Thermostat calibration and drift correction
- Remote access setup and app pairing
- Zone control thermostat configuration
About C-Wire Requirements
Many smart thermostats require a common (C) wire for continuous 24V power. Older homes often don’t have one run. We can install a C-wire adapter at the furnace or air handler that uses existing wiring, so you don’t have to run new wire through finished walls. This typically adds $40, $60 to the installation.
Schedule Thermostat Installation
Call 405-375-4822 or book online. We bring the thermostat or install yours.
Book OnlineFrequently Asked Questions
How much does thermostat installation cost?
Thermostat installation is typically $89-$149 in labor, depending on wiring complexity. Smart thermostats range from $79 (basic) to $249 (Ecobee, Google Nest). If a C-wire adapter is needed, add $40-$60. Thermostats provided by the homeowner are installed at the same labor rate.
Does my smart thermostat need a C-wire?
Most modern smart thermostats, Ecobee, Google Nest, Honeywell T6/T9, require a C-wire for continuous power. Some older homes don\’t have one. We install a C-wire adapter at the air handler using your existing wiring in most cases.
Can you program my new thermostat for me?
Yes. We set up schedules, connect to your Wi-Fi, pair the app on your phone, and configure system type (heat pump, gas furnace, dual-fuel) correctly. Incorrect system type settings are one of the most common causes of new thermostat problems.
My thermostat display is blank, is it broken?
A blank display is usually a tripped breaker, a blown fuse on the control board, or a loose R-wire connection, not a dead thermostat. We diagnose the root cause before recommending replacement.
Will a Nest or Ecobee work with my Trane system?
It depends on your system. Standard single-stage and two-stage Trane systems can work with Nest or Ecobee, but you may need a relay panel for proper operation. Communicating systems like the Trane XV18 are designed to work with the Trane ComfortLink thermostat, a third-party stat won’t access the full diagnostic and reporting features. I’ll check your wiring before recommending anything. Call 405-375-4822 and I’ll tell you straight.
Does OG&E offer a rebate on smart thermostats?
Not in 2026. OG&E says its Oklahoma residential rebates are closed and will return in 2027. Rebates and incentives change by utility and program date. Tell me your ZIP code and electric utility and I will check the current official program before quoting an amount. I handle the install either way.
What is the Trane ComfortLink thermostat and do I need it?
The Trane ComfortLink XL824 and XL1050 are communicating thermostats that talk directly to your Trane equipment. They report real-time system data, flag issues before they become breakdowns, and connect to the Trane Home app for remote control. If you have a Trane XV18 or other communicating system, the ComfortLink is what gets you the full 12-year warranty coverage and diagnostic capability. It comes included with Tiers 3-5 of our new system installs.
How much will a smart thermostat actually save me?
It depends on your schedule, your system, and your utility rate. ENERGY STAR says a certified smart thermostat will help you save money and stay comfortable. The bigger win is comfort, scheduling, geofencing, and remote control so your house is the right temperature when you get home without running the system all day.
Can you install and set it up for me?
Yes, and I’d recommend it for communicating systems especially. A dealer-installed thermostat on a new Trane system keeps your warranty intact and I configure it properly before I leave. I also show you the app so you know how to use it. That live walkthrough is worth more than any YouTube tutorial.
Nearby Communities I Serve