NoxPump

NoxPump is a heat pump planning and running cost calculator for homeowners considering the switch from gas, oil, or electric heating. Designed to be used at the kitchen table with a utility bill in hand — punch in your house details, get honest answers.

Four questions answered: How cold is my location? How much heat does my house need? What size heat pump do I need? Will I save money?

Features

• NASA POWER satellite climate data for any location on Earth
• Monthly temperature charts, heating degree days, ground temperatures
• Heat demand estimation from house characteristics or your gas bill
• Air source vs ground source comparison with COP estimates
• Running cost comparison against gas, oil, electric, LPG, or solid fuel
• Time-of-use tariff support for cheap overnight electricity
• 20-year financial projection with payback period
• CO₂ savings with tree-equivalent offset
• Metric and imperial units, multiple currencies
• Works offline once climate data is cached
• Light and dark mode
• No subscriptions, no in-app purchases, no ads

Support

If you have a question, found a bug, or want to suggest a feature, please get in touch via GitHub Issues:

• Ask a question
• Report a bug
• Request a feature
• Browse existing issues