Market guide
Air cooled or liquid cooled
Compare output, duty, sound, site work and long-term service across engine classesAir-cooled home generators dominate common residential sizes. Liquid-cooled systems cost much more and can suit higher loads or demanding duty. Moving classes is an installation and ownership decision, not a simple upgrade.
01
Air cooled
Common and compact has operating limits
Air-cooled engines run at higher speed and need documented oil, filter and inspection routines during extended outages.
- Duty
- Read the exact continuous-outage maintenance instructions.
- Sound
- Compare rated sound and the real property line.
02
Liquid cooled
Higher duty brings a larger project
A radiator, coolant, larger engine, heavier enclosure and often lower operating speed create different freight, pad and service needs.
- Use
- Justify the class with actual load or outage duty.
- Quote
- Include crane, coolant and specialist maintenance.
03
Service
Local competence can reverse a brand ranking
A well-supported machine with stocked parts can be more reliable in practice than a preferred badge whose technician travels hours.
- Interview
- Ask who performs warranty and storm calls.
- Parts
- Ask which controllers, sensors and service kits are stocked.
Evidence used
First-party sources behind this guide
- 01Current home standby generatorsGenerac · checked August 15, 2026Open source
- 02Current home generatorsKOHLER Home Energy · checked August 15, 2026Open source
- 03Generator buying guideConsumer Reports · checked August 15, 2026Open source