My house is both very large and very old, with high ceiling, lots of windows, and two stories. Despite a whole bunch of renovation, the home is difficult to heat and cool. There are rooms that tend to heat up in the summer, and others that are typically freezing cold in the winter. Because of the size of the house, lots of rooms are completely unused and others are often empty. The house is equipped with a forced air furnace, central air conditioner, and duct system, with registers in all of the rooms. When I first moved in, there was a single thermostat located in the living room. The thermostat reacted to conditions in the living room, maintaining that one room to the ideal temperature. This means that all of the empty and unused rooms were also kept at the perfect temperature. If I wanted to warm up those chilly spaces or cool down those overheated rooms, I needed to alter the temperature in the entire house, forcing the heating/cooling system to work much harder. My monthly energy bills were ungodly high, and the house wasn’t all that comfortable. I finally hired a local HVAC contractor to upgrade my heating/cooling equipment to zoned control. A series of valves was installed into the ductwork which allows me to target heated or cooled air to specific rooms. Each room is equipped with an independent thermostat, providing customized settings for each space. Family members can now make adjustments according to personal preference, and I have significantly trimmed expenses. Plus, there’s a lot less wear and tear on the furnace and air conditioner.