Last updated: September 27, 2026
A smart thermostat is one of the least expensive upgrades you can make to a heating and cooling system, and one of the easiest to get wrong. Set up correctly, it keeps your home comfortable on a schedule, lets you adjust from your phone and reports how your system runs. Set up poorly, especially on a heat pump, it can drive up your electric bill.
Short answer: A smart thermostat cuts wasted runtime and makes scheduling easy, but on a heat pump it only saves money if it's set up correctly, especially the auxiliary heat lockout and modest setbacks. Check compatibility before you buy, and see whether you qualify for Clark Public Utilities' discount.
What is a smart thermostat and how does it work?
A smart thermostat is a Wi-Fi–connected thermostat. It controls your heating and cooling just like a standard thermostat, but it also follows or learns a schedule, adjusts based on whether anyone is home, and lets you control it from your phone. Programmable thermostats only follow a schedule you enter. When comparing smart models, these are the features to look for:
- Wi-Fi control from a phone app, from anywhere
- Learning or suggested schedules based on your habits
- Occupancy sensing through motion sensors, room sensors or your phone's location, to ease off when no one's home
- Remote room sensors (on some models) that balance temperatures between rooms, not just the hallway
- Energy reports showing runtime and trends
- Maintenance reminders for filter changes
- Alerts for unusual temperatures or system problems
What a smart thermostat can and can't do
It can:
- Cut wasted runtime while you're asleep or away
- Make it easy to stick to a schedule, since you can adjust it without walking to the wall
- Show when your system runs longer than usual, often an early sign of a problem
It can't:
- Make an undersized, failing or poorly maintained system efficient
- Fix leaky ducts, poor insulation or an unbalanced airflow design
- Make one thermostat control rooms on separate systems
Savings depend on your habits before the upgrade. If you already adjusted your thermostat carefully, you'll save less than someone who left it at one setting all day.
Heat pump owners: get the setup right
This is where smart thermostats most often go wrong in Vancouver homes.
Auxiliary heat lockout. Heat pumps have backup electric heat strips that cost far more to run. A properly configured thermostat keeps auxiliary heat off above a set outdoor temperature, so the heat pump does the work in mild weather. Many thermostats use an outdoor temperature from the internet or an outdoor sensor for this. Out of the box, some default to bringing on backup heat too readily.
Modest setbacks. Deep overnight setbacks, like dropping 8–10 degrees, make sense for a furnace. With a heat pump, a big setback can trigger costly backup heat during morning recovery. Setbacks of 2–4 degrees usually work better. Look for a thermostat with smart recovery for heat pumps.
Correct wiring for the reversing valve. Heat pumps use a wire (O or B) that switches between heating and cooling. If it's set up backward, the system cools when you ask for heat.
Dual-fuel systems. If you have a heat pump with a gas furnace backup, the thermostat has to manage the switchover temperature between the two. That takes a model and setup built for dual fuel. See Heat Pump vs. Furnace for how dual fuel works.
Are you in need of professional services for your home’s heating and cooling systems?
Contact Tri-Tech Heating, Inc. for expert solutions today!
Compatibility: check before you buy
- The C-wire: Most smart thermostats need a common wire (C-wire) for continuous power. Many older homes don't have one. Adapters exist, but a technician can confirm the right fix.
- Multi-stage and variable-speed equipment: Two-stage furnaces, multi-stage heat pumps and communicating systems may need a specific thermostat, or the manufacturer's own control, to use all their features.
- Ductless mini-splits: These usually run on the manufacturer's own remote and Wi-Fi app, not a standard wall thermostat.
- Electric baseboard and wall heaters: These run on line voltage (120/240V) and need line-voltage thermostats. Standard smart thermostats aren't compatible.
- Boilers and radiant heat: These can use smart thermostats, but wiring and zoning differ from forced air.
The Clark Public Utilities smart thermostat discount
Clark Public Utilities currently offers instant discounts on select smart thermostats, from free to about $150 depending on the model, through its online marketplace. As of this writing:
- Eligible: residential customers heating with an electric forced-air furnace, air-source heat pump or ground-source heat pump
- Not eligible: homes heated with gas, or with dual-fuel systems
- Limits: one thermostat per system, up to two per home
- Compatibility: Use the program's compatibility checker before ordering. Ductless heat pumps and electric resistance heaters aren't compatible.
- Funding: The offer is available while funding lasts.
Offers change, so check Clark Public Utilities' smart thermostat page for current models and pricing.
Smart thermostat installation: DIY or professional?
Swapping a thermostat on a simple single-stage furnace and AC with a C-wire is a reasonable DIY project for a handy homeowner. Turn the power off first, and photograph the old wiring before you disconnect it.
Call a professional for:
- Heat pumps, where auxiliary heat lockout and reversing valve setup matter
- Dual-fuel systems
- Homes without a C-wire
- Multi-stage, variable-speed or communicating equipment
- Boilers, zoned systems, or anything that didn't work right after a DIY install
How to use a smart thermostat to save energy
- Set a schedule and keep it simple: one setting for home, one for sleep, one for away.
- Heat pumps: Keep setbacks modest and confirm auxiliary heat is locked out in mild weather.
- Use room sensors if one room is always off. The thermostat can average several rooms or prioritize the ones you're in.
- Check the energy reports each month. A sudden jump in runtime is worth a service call.
- Don't use Emergency Heat unless the heat pump has failed.
- Keep the thermostat away from sunlight, supply vents and heat sources, which cause false readings.
Need help choosing or installing one?
Tri-Tech Heating, Inc. installs and configures thermostats for furnaces, heat pumps, dual-fuel and zoned systems across Vancouver, Camas, Salmon Creek and Clark and Cowlitz Counties. Our work is 100% guaranteed.
See our HVAC terms glossary and seasonal maintenance checklist, or contact us.
Our office is open Monday through Friday, 8:00am to 5:00pm, and a call to (360) 891-2002 during those hours reaches a person. Outside those hours, email info@tri-techheating.com, and our on-call technician will reply with an ETA. Licensed HVAC #TRITEHI952LL, CCB #161426.
Are you in need of professional services for your home’s heating and cooling systems?
Contact Tri-Tech Heating, Inc. for expert solutions today!
Frequently Asked Questions
What if the Wi-Fi goes down?
The thermostat keeps running your schedule and responds at the wall. You just lose remote control until the connection returns.
Company Information
Tri-Tech Heating, Inc.
6406 NE 116th Ave Unit C
Vancouver, WA 98662
Phone: (360) 891-2002