I used this in a company prefab, but I no longer need it because I only use air conditioning now. It's a 2014 model, so it's old, but it works without any problems. Please purchase only if you understand that this is a used item. I may have overlooked something or not provided enough information in the description. Please examine the images and make your decision based on your understanding. It will be sent as is. Feel free to ask any questions you may have.