Free tools
Mini split planning tools
Work out what size each room needs and what the system typically costs, before we visit.
Pick the question you have
- Size calculatorMini split size calculatorA planning BTU range for each room, from its size, ceiling, sun and insulation, checked against your county's winter low.
- Cost calculatorMini split cost calculatorOur typical range for a new system, an ADU or a replacement, line by line, with Energy Trust or Clark Public Utilities amounts beside it.
Which tool should you start with?
Start with the size calculator if you want to know how big each head should be. Start with the cost calculator if you know the rooms and want a planning range.
Both are free from Firlands Portland Mini Splits, and either result can go with an estimate request, so you only describe the house once.
- The size calculator asks about each room: its size, ceiling, sun, use and the house's insulation and location.
- The cost calculator asks about the job: the number of heads, the head type, the line run, drains, the panel and the heat it replaces.
What will the calculators show?
The size calculator gives a BTU range per room, checked against a winter design low of 24°F in Portland. The cost calculator gives our typical range, with each part as its own line.
A standard one-head install runs $4,000 to $8,500; a two-head system runs $6,500 to $12,000. Your price is set in the written estimate after the site visit, and the Portland cost guide explains each driver.
Your answers stay in your browser
Both tools run on this page. Your answers go into the page address so you can share a link, and nothing is sent anywhere unless you send it with the form.
The privacy policy explains what the form sends and how we use it.
Questions about the tools
Do I need to know my panel size or room measurements to use the tools?
Rough figures are fine. The panel question takes "I don't know", and a room size from length times width is close enough. Nothing asks you to open a panel. We measure the rooms and check the panel at the site visit.
Can I send a tool result to my partner or landlord?
Yes. Both tools write your answers into the page address, so copying the link shares the same result. Nobody else sees it unless you send the link or include it with the form.
Which tool should I use if I already have a mini split?
The cost calculator. Choose "Replace an existing mini split" and tell it whether the old lines pass the pressure test and whether anything is moving. That decides between our like-for-like and more-work ranges.
Prefer to talk it through?
Call or send the form. We start with the rooms that aren't comfortable.