For years, DC-coupling was the way off-grid systems worked. Then AC-coupling took over. Now, interconnection bottlenecks and new tax incentives are bringing DC-coupling back – this time at commercial scale. HeatSpring instructor Wes Kennedy walks through the economics and engineering: […]

When building performance professionals seal air leaks and improve insulation, they’re fundamentally changing how air moves through a building. This can have serious consequences for fuel-burning appliances like furnaces, water heaters, and gas stoves. That’s where combustion safety testing plays […]

So you want to have better indoor air quality at home but you aren’t sure what to do.  If you follow my articles, you know you shouldn’t buy an electronic air cleaner.  Instead you should stick with the tried-and-true methods of source […]