Heating and Cooling Units We work with central HVAC units, unit heaters, wall heaters, pool heaters, etc. We also work with tankless and standard water heaters, ranges, ovens, cooktops, and gas dryers. Motor Homes Our fill stations can accommodate the largest motor homes. Cylinder Fills Bring in your gas grill or tow motor cylinders and pay for only what we put in. Unlike many exchange operations, we do NOT short-fill tanks.