About

Why Splitsizer exists

Heat-pump research gets messy fast. A homeowner starts with one simple question, "What size do I need?", and ends up juggling square footage, climate, insulation, ceiling height, rebates, electrical work, and installer quotes. Splitsizer keeps the first step narrow: estimate a practical BTU range before you compare equipment.

Splitsizer is brand-neutral. We do not manufacture heat pumps or sell equipment directly. The calculator starts with the shape of your project, returns a first-pass size range, and points out when the job is large enough to justify a formal load calculation.

Who runs it

One independent operator. No manufacturer relationships, no sponsored placements, and no paid editorial slots. If product links are added, they may use Amazon affiliate tags. If installer quote forms are added, the sharing relationship will be explained before you submit anything.

How we size

The calculator uses a simple BTU-per-square-foot baseline with adjustments for climate band, insulation, sun exposure, and ceiling height. Output is a BTU range, snapped to the nearest standard system size. This is screening guidance. For whole-home, multi-zone, cold-climate, or permit-sensitive installs, confirm the final size with a qualified installer.

Boundaries

• The calculator is a screening tool, not a full HVAC design.
• The output appears in the browser without an email signup.
• Manufacturer payments do not control placement.
• Rebates and tax credits need to be verified against official rules for your project date and location.

Found something wrong on the site? Email hello@splitsizer.com and we'll fix it.