Free Heat Pump Calculators — Size, Cost & Savings (2026)<br>⚡ Free Heat Pump ToolsHeat pump calculators that actually make sense<br>Size it, price it, and see your real savings in 60 seconds — built on US DOE & ENERGY STAR methodology, with no signup and no sales pitch.<br>Size my heat pump →Estimate my cost<br>✓ 100% free · no signup✓ Based on US DOE / ENERGY STAR✓ Instant results
14<br>Free calculators
50<br>US states covered
DOE<br>Methodology-based
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Calculators<br>Pick a calculator<br>Each one gives an instant, plain-English answer — then shows the math so you can trust it.
📏<br>Size / BTU<br>Find what size heat pump you need in BTU and tons, using square footage, climate zone, insulation and ceiling height.<br>Open calculator →<br>💲<br>Cost<br>Estimate the installed cost of a new heat pump in 2026, including system type, size, zones and state or utility rebates.<br>Open calculator →<br>💰<br>Savings<br>See how much you could save per year by switching to a heat pump from your current heating system.<br>Open calculator →<br>⚖️<br>vs Gas Furnace<br>Compare the annual running cost of a heat pump against a gas furnace for your home.<br>Open calculator →<br>kWh / Energy<br>Estimate how many kilowatt-hours and dollars your heat pump uses for heating each year.<br>Open calculator →<br>🔢<br>HSPF / COP<br>Convert HSPF to a seasonal COP, estimate your annual heating cost, and see how much a higher-HSPF heat pump saves.<br>Open calculator →<br>🌡<br>Balance Point<br>Find the outdoor temperature below which your heat pump needs backup (auxiliary) heat.<br>Open calculator →<br>🏊<br>Pool Heat Pump<br>Find the BTU size of pool heat pump you need to hold your target water temperature.<br>Open calculator →<br>🔌<br>Mini-Split Sizing<br>Find the BTU and recommended head size for a ductless mini-split, room by room.<br>Open calculator →<br>🚿<br>Water Heater<br>See the right tank size and how much a heat pump water heater saves vs your current one.<br>Open calculator →<br>📈<br>Payback / ROI<br>How many years until a heat pump pays for itself — and the long-term net.<br>Open calculator →<br>🌿<br>CO₂ Savings<br>Estimate the carbon emissions you avoid each year by switching to a heat pump.<br>Open calculator →<br>⚙️<br>Generator Size<br>Find the running and starting watts — and the generator size needed to run your heat pump.<br>Open calculator →<br>Breaker / Wire Size<br>Find the breaker amperage and copper wire gauge from your heat pump nameplate (MCA & MOCP).<br>Open calculator →
How to size and choose a heat pump<br>Buying a heat pump comes down to three questions: what size do I need , what will it cost , and will it actually save me money . Get the first one wrong and everything else suffers — an oversized unit short-cycles and wears out early, while an undersized one can't keep your home warm on the coldest nights.<br>The right size is set by your home's heat loss, not a number someone gave you at a barbecue. As a starting point, capacity scales with floor area and climate: a 1,800 sq ft home needs roughly 3–3.5 tons in a cold climate but only ~2.5 tons in a mild one. Insulation, ceiling height and air-sealing move that number up or down.<br>Bigger is not better. The goal is "just right," confirmed by a contractor's Manual J load calculation — our calculators get you a reliable starting estimate first.<br>The 4 steps<br>StepWhat to doTool1. Size Find your BTU / tonnage from square footage + climateSize calculator2. Price Estimate installed cost by type, minus any rebatesCost calculator3. Compare Check running cost vs your current furnaceSavings calculator4. Verify Find the balance point for cold-climate backupBalance point5. Install Compare contractor scope, permits, electrical work and commissioningInstallation guide💡 Money tip: the federal 25C/25D tax credits expired Dec 31, 2025 — but most savings now come from state and utility rebates , which can still run $500–$10,000. Check your state rebates.
Why a heat pump<br>One system, lower bills, no combustion
❄️<br>Heats and cools<br>A heat pump replaces both your furnace and your AC with a single, efficient unit.
2–4× efficient<br>It moves heat instead of burning fuel, delivering 250–400% efficiency (COP 2.5–4).
💰<br>Rebates available<br>State and utility rebates can still cut hundreds to thousands off the installed price.
🌿<br>No on-site emissions<br>No gas burning means no carbon monoxide risk and a smaller carbon footprint.
Popular<br>What size heat pump do I need?<br>Jump to the guide for your home size — each shows the answer by climate zone.
800 sq ft1,000 sq ft1,200 sq ft1,500 sq ft1,800 sq ft2,000 sq ft2,200 sq ft2,500 sq ft2,800 sq ft3,000 sq ft3,500 sq ft4,000 sq ft
Guides<br>Learn before you buy
📖<br>What is a heat pump?<br>How it works, the types, pros, cons and costs — explained simply.<br>Read guide →<br>⚙️<br>How heat pumps work<br>The refrigerant cycle and reversing valve, step by step.<br>Read guide →<br>⚖️<br>Heat pump vs gas furnace<br>Cost, efficiency and which is cheaper for your home.<br>Read guide →<br>🤔<br>Are heat pumps worth it?<br>An honest cost-benefit look for 2026 — when they pay off.<br>Read guide →<br>🌬️<br>Air-source heat pumps<br>The most common type — how they work, cost...