— By Richard Boothman — Increasing winter heating efficiency. Restaurants, retail outlets and shopping centers face plenty of efficiency challenges with heating during the winter. There are, however, easy tweaks, procedures at startup and specialized equipment that can save energy, reduce costs and improve the lifespan of the HVAC system. While oversizing and under-sizing are also common problems, there are ways to minimize their negative effects. A key step to take early on is to make sure the building is pressurized so that it’s not pulling out more conditioned …