It’s important to make sure your HVAC system is large enough to effectively heat and cool your entire space. To figure out the right size of HVAC system for your home, you’ll want to compare the square footage of your space to the British Thermal Units (BTUs) that the HVAC will put out.  Generally speaking, a home that is around 1,000 to 1,500 square feet will need a system that puts out around 21,000 to 24,000 BTUs. Meanwhile, larger homes that are between 2,000 and 2,500 square feet will need a larger unit that puts out at least 30,000 to 34,000 BTUs.