by MarkJ » Fri 18 Sep 2009, 08:21:22
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How about those A/C condenser unit replacements that you make over $1,000 on.

We do more complete retrofit Furnace and A/C installations than add-on or replacement/upgrade A/C installations. Much more profit, plus forced air units are piece of cake to replace while you have everything torn apart to install new plenums, coils etc.
The big bucks are in retrofit boiler or boiler/indirect water heater(s) installations in existing construction structures. You can make an easy 2 /3/4K for a days work if your fast, plus have the right knowledge, skills, tools, equipment, hardware and supplies. When I work alone, I can knock out some of the easy jobs in less than 8 hours.
There's also good money in newer salvaged boilers, furnaces, water heaters, A/C equipment, tanks, salvaged parts and salvaged iron, steel, copper and brass. Some equipment we replace due to fuel conversion, oversizing, expansion, efficiency, space, system re-design, landlord single to multiple unit conversions etc is less than a couple years old.
The biggest gravy jobs are mobile home furnaces. I once installed 6 in one day in a single mobile home park @ a profit of around $1500 each, plus many of the units were worth 2 or 3 hundred bucks in salvage parts. You just lift the old ones off the base, set the new one on the base, plug it in, connect fuel lines, connect roof jack, purge, bleed, combustion test and you're done.
Plenty of extras in mobile home service as well since many need new roof jacks, roof repair, duct repair, new fuel tanks, new lines, freeze-proofing etc.