The Ultimate Cat House is a heated house with the 3 most popular options, Square Window, infared bulb, door upgrade. LARGE ULTIMATE RED & WALNUT $419.00 LARGE ULTIMATE NATURAL $419.00 LG ULTIMATE CEDAR LG DOOR $449.00 LARGE ULTIMATE BRICK $439.00 ULTIMATE NATURAL $369.00 ULTIMATE OAK & WALNUT/ 1 DOOR $369.00 LG ULTIMATE OAK & WALNUT $419.00