When you add a room to your house, your existing HVAC can't handle both spaces. A 3-ton system serving an addition loses a third of its capacity for the original house. The fix: upgrade to 4 tons, resize the main trunk, and add zoning so the addition and original house each have their own thermostat.
Chapters
This is the original house, this is the addition. So for the original house, you have your duct system and you have your runs coming off of that duct system. So they said one day we're going to build this addition. Now, a couple of problems. First problem is, for example, let's say this home is a three ton. Let's say this little thing here only takes a ton of air. So now it equals 2 tons for this home. It's going to make this to start being uncomfortable. And this is always going to be uncomfortable. The thermostat is probably towards the middle of the house. Well, there is no way that thermost that can tell you what the temperature is in that room. So how do you solve the problem? We need a 4 ton unit and we need what we call zoning. Resize this main trunk line for 4 tons. Have that ton of air going back to this room. Keep 3 tons of air in this part of the house. But we're also going to zone it. So that means we're going to put a thermostat here and we're going to put a thermostat in here. So now this room always has the temperature reading compared to.