The right size.
For your home.
Generator, cooling, hot water or solar.
Find your starting size, with the working shown.
Free to use. No signup. A planning range, with assumptions you can adjust.
What are you sizing?
Start with the job your equipment needs to do.
Cooling & heating
Comfort starts with the load, not the floor area alone.
Hot water & humidity
Match capacity to the way you use your home.
A few common questions.
An answer for a specific home. Then make it yours.
A starting point.
With the working shown.
You should be able to see where the number came from.
Your home
Area, insulation and the equipment you actually use.
Your location
County climate zones and a representative solar weather snapshot.
Your assumptions
Every calculation shows its inputs, range and limits.
Buy the right size once.
Make your next conversation with a contractor more useful.