Generator sizing Last reviewed June 2026

What Size Generator for a 2,000 Sq Ft House?

By the WhatSize editorial team 5 min read Standards-reviewed

TL;DR

For a 2,000 sq ft house, you need at least a 7,500-watt generator to run essentials (fridge, lights, well pump, furnace fan). For whole-house backup including central AC, you need 14,000-22,000 watts with a standby generator.

Looking for a different size? See What Size Generator to Run a Sump Pump? or browse all generator sizing guides.

What a 2,000 Sq Ft Home Needs During an Outage

A 2,000 sq ft home typically has 3-4 bedrooms, central HVAC, a well pump or municipal water, and the usual array of appliances. During a power outage, you don't need to power everything at once — but you do need to prioritize.

The essential circuits — refrigerator, furnace fan, well pump, lights, and a few outlets — typically draw about 3,500-5,000 running watts. Adding a window AC unit or microwave brings you to 5,000-6,000W. For the whole house including central AC (3.5 ton), you're looking at 10,000-14,000W running, requiring a 14kW+ standby generator.

A 7,500W portable generator is the sweet spot for most 2,000 sq ft homes — enough for all essentials plus space for a window AC, but affordable at around $800-1,000.

Top picks for this size

BEST OVERALL

DuroStar DS13000MX 13,000W Dual Fuel #ad

13,000W, Dual Fuel, Electric Start, Whole Home Backup

★★★★☆ 4.6 · 177+ ratings

Dual Fuel (Gas/Propane)13,000W PeakElectric Start

$899 approx

Check price

MID-RANGE

Westinghouse 5000W Dual Fuel Inverter #ad

★★★★☆ 4.7 · 19.3K+ · $949

Amazon

These Amazon-available picks meet the calculated spec. For region-specific or licensed contractor-installed options, consult a local professional. See our Disclaimers.

7,500W vs 14,000W: Which to Choose?

Choose 7,500W portable if: you only need essentials (fridge, furnace, well pump, lights), you're willing to manually connect via transfer switch, budget under $1,000
Choose 14,000W standby if: you want automatic backup, need to run central AC, have medical equipment, want whole-house coverage
Choose 22,000W standby if: you have electric heat, electric water heater, large central AC, or a home business

Frequently asked questions

What size generator do I need for a 2,000 sq ft house?

A 7,500W generator can run most essentials in a 2,000 sq ft home but not everything at once. You'll need to prioritize — run the fridge, furnace fan, well pump, and lights, but not the central AC, electric dryer, or oven simultaneously.

How do I connect a portable generator to my house?

The safest way is a manual transfer switch installed by an electrician ($500-800 installed). Never plug a generator into a wall outlet — this can backfeed power and electrocute utility workers.

What's the fuel consumption of a 7,500W generator?

A 7,500W generator running at 50% load burns about 0.6-0.8 gallons of gasoline per hour. A full tank (6-8 gallons) gives you 8-10 hours of runtime. Consider a dual-fuel model that runs on propane for longer storage life.