Here's what we do here, Thomas. We send a technician to your place to check the area and then give you the best recommendation. We have a lot of models, such as Carrier and American Standard. Those are top HVAC brands. You can talk to our technician for a better recommendation on the task. We usually don't have Day & Night HVAC, but it depends on the technician if they recommend that manufacturer. So what I'm going to do is set up an appointment with our technician to give you an estimate on how much it would cost to install a heater and air conditioner. You don't have to worry since our technicians are licensed and certified, so you can be sure that we can do the right business. Keep this line open on the day since our technicians will give you a call 30 minutes before they arrive.