Should you heat one room with a space heater or warm the whole house with central heating? The answer depends on your home size, insulation, fuel type, and how many rooms you actually use. This comparison breaks down the real costs of space heaters versus furnaces, heat pumps, and boilers so you can make the smartest heating decision for your budget.
One 1,500W heater run 8 hrs/day costs about $66/month. Heating the whole 2,000 sq ft house costs about $169 on a 92% gas furnace, $208 on a heat pump, or $584 on electric-resistance central heat. If you genuinely occupy one or two rooms, zone heating wins.
This is the ordering most guides get backwards. Space heaters are electric resistance — the dearest fuel per BTU — so their advantage is largest against the one central system that uses the same fuel. Against electric baseboard or an electric furnace you would need about 8.8 heaters running to spend as much.
A gas furnace makes heat about three and a half times cheaper per BTU than any space heater, and a heat pump nearly three times cheaper. Break-even arrives at roughly 2.6 heaters against gas and around three against a heat pump — so the opportunity here is one or two rooms, not a whole-house strategy.
| Feature | Space Heater | Central Heating |
|---|---|---|
| Heating Method | Direct electric heat in one room | Distributes heat throughout entire home |
| Upfront Cost | $25–$150 per heater | $3,000–$8,000+ (furnace/heat pump/boiler) |
| Cost per 1,000 BTU Delivered | $0.054 — the dearest fuel there is | $0.016 gas · $0.019 heat pump · $0.054 electric |
| Cost per Room | ~$66/month (1 room, 1,500W, 8 hrs/day) | $169–$584/month for the whole house |
| Cost for 3 Rooms | ~$198/month (3 heaters) | Already past a $169 gas furnace |
| Energy Efficiency | 100% (1:1 conversion) — no heater type beats this | 80–95% AFUE gas, or seasonal COP 2.0–3.2 for a heat pump |
| Room Coverage | ~150 sq ft per 1,500W at 10 W/sq ft | Whole home (1,000–3,000+ sq ft) |
| Where Zone Heating Pays Most | Against electric baseboard or an electric furnace | Electric central runs about $584/month — the gap is huge |
| Where It Pays Least | Against a modern gas furnace or a heat pump | $169 gas / $208 heat pump — break-even at 2–3 heaters |
| Temperature Control | Per-room thermostat (if equipped) | Whole-home thermostat with zoning options |
| Installation | Plug into wall outlet | Professional installation required |
| Maintenance | Minimal — occasional filter cleaning | Annual professional service recommended |
| Best For | Supplemental heat, one-room use, renters | Whole-home heating, homeowners, long-term savings |
Start from the fuel, because that is what most zone-heating advice gets backwards. A space heater is electric resistance — the most expensive way to make heat there is, at about $0.054 per 1,000 BTU delivered. A 92% AFUE gas furnace makes the same heat for about $0.016 and a COP-2.8 heat pump for about $0.019. Zone heating does not save money by being cheap heat; it saves money by heating less of the house.
That flips the usual ranking. The space heater's advantage is smallest against gas and heat pumps — break-even arrives at roughly 2.5 heaters against a gas furnace and 3.1 against a heat pump — and largest against electric-resistance central heat, where you would need about 8.8 heaters running to spend as much. If your house has baseboard or an electric furnace, zone heating is the single biggest lever you have. If it has a modern gas furnace, one or two heaters is the whole opportunity.
| Scenario | Space Heater | Central Heating | Note |
|---|---|---|---|
| Cost per 1,000 BTU delivered | $0.054 | $0.016 gas · $0.019 heat pump · $0.054 electric | Resistance heat is the dearest fuel there is |
| 1 room heated | $66/mo | $169/mo (92% gas) | Zone heating wins clearly while you heat one room |
| 2 rooms heated | $133/mo | $169/mo (92% gas) | Still ahead of a gas furnace |
| 3 rooms heated | $199/mo | $169/mo (92% gas) | Break-even against gas is about 2.5 heaters |
| Break-even vs a heat pump | $199/mo at 3 heaters | $208/mo (COP 2.8) | About 3.1 heaters — the gap is narrow |
| Break-even vs electric central heat | $66–$266/mo | $584/mo (baseboard or electric furnace) | About 8.8 heaters — this is where zone heating really pays |
The most popular electric space heater in the US. Compact 1,500W design with built-in thermostat, overheat protection, and quiet operation. Great value for quick spot heating.
View on Amazon →Three heat settings, a 24-hour timer and a precise thermostat, with no fan at all — the quietest way to heat a bedroom. The oil holds heat after shutoff, which smooths the temperature swing but does not reduce the energy used. At 1,500W it suits roughly 150 sq ft on the 10 W/sq ft rule.
View on Amazon →Wall-mount infrared panel heater with WiFi control and voice assistant support, safe-touch exterior, no floor space needed. Heat Storm advertises 750 sq ft; at 1,500W the 10 W/sq ft sizing rule puts it nearer 150 sq ft.
View on Amazon →A well-built standard ductless mini-split, and genuinely quiet at 19 dB. Note that the GL series is not a Hyper-Heating (H2i) unit — H2i is Mitsubishi’s FH and FS series. If you need rated output far below freezing, buy an H2i model instead.
View on Amazon →Smart thermostat with room sensors that detect occupancy and adjust heating accordingly — the closest thing to true zoning without ductwork. Built-in Alexa and detailed energy reports. Ecobee’s own savings figures are marketing claims measured against a fixed thermostat; your result depends on how far your current schedule is from optimal.
View on Amazon →Affordable mini-split heat pump with inverter compressor and pre-charged line set. Senville rates LETO for heating down to about 4°F; their AURA series is the cold-climate line if you need output below that.
View on Amazon →