Guided system builder
Design your whole-home comfort system in minutes.
Tell us your rooms — we size the BTUs, match the right MRCOOL® 5th Gen condenser and indoor heads, and bundle it into one pre-charged, ready-to-ship kit.
Rule-of-thumb sizing with ceiling adjustment — not a Manual J load calculation. For tricky spaces, get a Manual J.
Build my system
One MRCOOL® 5th Gen condenser · up to 6 indoor zones
How many rooms (zones) are you cooling?
Each zone gets its own indoor head. One MRCOOL® 5th Gen DIY condenser (R-454B) powers them all.
Size each room
Drag to set square footage — we'll pick the BTU handler and pair the line set to each head.