Sizing is about balancing essential loads with cost. Most homes land in the 14kW to 22kW range, but HVAC equipment and electric appliances are the true drivers.
Loads That Matter Most
- Central air conditioning units
- Electric ranges and dryers
- Well pumps and sump pumps
- Medical equipment and home offices
Quick Rule of Thumb
If you need to cover one HVAC unit plus core kitchen and lighting circuits, start with an 18kW unit. Use the calculator for a tailored estimate.
FAQ
Does this guide apply nationwide?
Yes, but local permits and labor rates vary. Pair this guide with the location pages for city-specific details.
What should I bring to an installer quote?
Bring your preferred fuel type, estimated load needs, and any permit requirements you already know.