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Here is my setup with approximate costs - we were without power for over 2 weeks after hurricane Ike in 2008. During that time we borrowed a friend's generator - gasoline only. Based on that experience I knew that I wanted multiple fuel options - finding and dealing with the gasoline was a major hassle.

This has been a series of small projects over the years. The transfer switch feeds 6 circuits (1) freezer, (2) refrigerator, (3) microwave, (4) kitchen plugs, (5) living room plugs, (6) master bedroom plugs (for window A/C and furnace). I never considered powering the furnace until now so I added cords to the furnace yesterday.

2011 Powermate PM0675700 (5.7kW running, 7.1 kW peak, gasoline only), Home Depot (clearance) $450
2011 Tri-fuel kit (NG, propane, gasoline), US Carburation $200
2012 Reliance 6 circuit transfer switch and cord, Home Depot $300
2012 25 ft. 10/4 STW 30 Amp 125/250-Volt Power Cord $90
2013 50 foot natural gas hose, Fairview Fittings $220
2013 Natural Gas valve and quick disconnects, The WEBstaurant Store $150
2020 Mineral wool / OSB sound panels, ATSAcoustics.com / Home Depot $150
2021 Furnace cords, Lowe's $35
Total$1,595. Note that this does not include any labor - I have done all of the installation myself.