Whole House Generator Buying Guide for Massachusetts Homeowners

Massachusetts loses power in ways that are hard to plan around: coastal wind, heavy wet snow on old trees, and long rural feeders that take days to restore. A standby generator is the difference between an inconvenience and a week in a hotel.

Whole house or essential circuits?

This is the first and biggest decision, and it's where most of the cost sits. An essential-circuits system carries heat, the fridge, some lights, the well pump and a few outlets — usually via a transfer switch that serves a small sub-panel. A whole-house system carries everything, including air conditioning and the electric range.

Most homeowners who choose essentials-only are satisfied with it. The people who regret it are the ones with central air, an electric range, or a home office that can't tolerate a load-shed.

Sizing, honestly

• A typical Massachusetts single-family runs whole-house on roughly 18 to 24kW
• Essentials-only systems commonly land between 9 and 14kW
• Well pumps and air conditioning compressors have large starting loads and drive sizing more than their running watts suggest
• Oversizing wastes money and makes the unit run inefficiently at low load
• A load calculation is the only honest way to size it — anyone quoting from square footage alone is guessing

Natural gas or propane

Natural gas is simpler where there's a service line: no tank, no refills, no run-time limit. Propane is the answer where there isn't, and it stores well, but you need tank capacity sized for a multi-day outage, not an afternoon.

The transfer switch matters as much as the generator

An automatic transfer switch senses the outage, starts the unit, waits for it to stabilise, transfers the load, and switches back when utility power returns and holds. It also physically prevents backfeeding the grid, which is the part that protects line workers. Manual switches and interlock kits cost less and work fine, but somebody has to be home to operate them.

What installation involves

A concrete or composite pad, a fuel connection, the generator set itself, the transfer switch beside your panel, and the control wiring between them. Permits and an inspection apply. Budget one to two days of electrical work once the pad and fuel line are ready.