Space Heater vs. Central Heat Cost
Compare when a space heater may cost less than central heat and when it can become expensive.
Last updated: May 2026
Who this guide is for
This comparison is for deciding whether to heat one room with a space heater or adjust the whole-home thermostat.
What to compare
A space heater may make sense for one occupied room for a short period. It can become expensive if it runs many hours daily or tries to replace whole-home heating.
Buying guidance
Estimate hours first. Then compare the space heater's electric cost with your central heat fuel cost, safety requirements, and comfort goals.
Use the calculator first
Start with the related calculator, then use this guide to interpret the result. Sizes, costs, capacities, and product ratings should always be checked against current labels, reviews, and your actual room or aquarium setup.