Generator Installation

Start with the loads you need during an outage

Decide whether the goal is essential circuits, heating equipment, air conditioning or a wider whole-building backup arrangement. A gas furnace still needs electrical power for its controls and blower. An air conditioner or heat pump can place a different starting and running demand on the backup system.

Generator capacity should be assessed against the selected loads, equipment ratings and how they may operate together. The number printed on the generator is not enough to establish that it can start a particular compressor. Load management and the proposed transfer arrangement belong in that assessment.

What needs to be defined before installation?

Identify the generator model, supported circuits, transfer equipment, equipment location, fuel supply and responsible trades. Review clearances, exhaust, sound, service access and local approval requirements before selecting a location. Electrical work and any fuel-system changes should have a clearly assigned, appropriately qualified installer.

The written proposal should distinguish included site work from utility, building or other trade work. It should also explain testing, operating instructions, maintenance needs and which equipment the backup arrangement is intended to support. A generator installation does not automatically include changes to the HVAC equipment itself.

Keep portable and permanent-generator safety separate

Never operate a fuel-burning portable generator inside a house, garage or other enclosed space, and do not connect a generator to a wall outlet. Improvised connections can send power back toward utility lines and put people at risk. Follow the manufacturer's placement and operating instructions.

PG&E's backup-power safety guidance explains load limits, exhaust and preventing backfeed. Arrange the transfer and wiring design before an outage; do not improvise an HVAC power connection when the utility supply fails.

Information to have ready

Provide the property address, the equipment you want to operate, available model information and any existing backup installation. Confirm the assessment scope with the office before purchasing equipment. Exact capacity, installation work and cost depend on the property and the agreed loads.

Backup Power for HVAC Equipment

Heating and cooling loads need to be included explicitly in a backup-power design. Identify the existing equipment and planned upgrades, then confirm which circuits and operating combinations the proposed arrangement supports.

Service Questions

Do generators support HVAC systems?

Some backup generators can support heating and cooling equipment, but correct sizing is essential. We review the electrical load and comfort priorities before installation.

Can a generator power a heat pump or AC?

It may be possible if the generator, transfer equipment, and HVAC startup load are designed correctly. We coordinate load planning so the system is reliable.

Include any planned heat-pump installation or water-heater replacement in the load discussion. Our estimate guide explains how to separate included installation work from other-trade responsibilities.