Sinclair HVAC & Plumbing now has a LonMark Certified Professional on staff to service or install commercial HVAC control systems. … Lubbock HVAC, Plumbing, and Energy Management Blog … -Having an intelligent control system following a LonMark specification has been shown to save upwards of 30% annually in energy costs over a non-integrated, non-intelligent control system. Wow! -With continuous commissioning and implementation strategies, this …