Programmable & Smart Thermostats: An Educational Overview

Thermostats save energy through setbacks: heating or cooling less when nobody’s home or everyone’s asleep. The savings scale with setback depth and duration — consistent habits beat aggressive one-day swings.

Compatibility basics (education, not instruction)

• Low-voltage systems (24 V central HVAC) vs line-voltage (electric baseboard) — different products entirely, and line voltage is professional work.
• The C-wire ("common") provides continuous power many smart thermostats need; older systems may lack one — power adapter kits exist, or choose models designed for C-wire-less systems.
• Heat pumps have different setback economics — deep setbacks can trigger inefficient resistance-heat recovery. Heat-pump-aware schedules or models handle this.

Schedules that work

A common pattern: setback while at work, recovery ~30 minutes before arrival, second setback overnight. The exact degrees matter less than consistency — pick comfortable-unoccupied temperatures and hold them.