Millions of homes don’t have a C-wire — and that used to mean you were stuck. In 2026 that’s no longer true. Here’s exactly how smart thermostats work without one, and which options are worth your money.
Smart thermostat brands claim you’ll save $150-$400 per year. But do the numbers actually add up? We break down real energy savings data so you can decide if it’s worth the investment.
Ecobee or Nest — which smart thermostat is worth buying in 2026? We compare price, design, room sensors, Apple HomeKit support, and real energy savings to help you decide.
No C-wire? No problem. The best smart thermostats for older homes in 2026 — Google Nest and Ecobee compared honestly with installation tips.