Yes, retroactive mods. Because of new state laws, and pricing regulations, since the state sets certain limits of fuel prices for heating etc. boilers over one million BTU's had higher energy costs, so we wherever possible re rated the boilers by modifying them, or replacing them with high efficiency boilers and the state, feds, and gas company's would pay a portion of the costs if they qualified and that with the reduced operating costs would ROI in 2 years or less.
We don't have many oil fired systems out here for smaller bldg's. But there were a lot of gas/oil fired boilers for large bldgs, and if those were replaced and oil firing done away with, there was a lot of savings there as well.
When I read of the fluctuating oil prices for the oil used in home heating in the east, I am real happy to be out here, plus the thought of a snow storm shutting off the supply, {{{{SHUDDER}}}}