If you're building a sunroom or home addition consider installing a ductless system like the Bosch mini-split we had installed in Frank's sunroom. Because there is no ductwork, these systems are great, easy to install, hassle-free options to heat and cool your space. https://www.bosch-homecomfort.com/us/en/ocs/residential/climate-5000-ductless-system-1115909-p/ Bosch Home Comfort Bosch Global | Mike Holmes Jr.