In Phoenix, Arizona a furnace entirely isn’t a priority, the key is to have a wonderful cooling system to get through the long, sizzling year… I have made the necessary arrangements. I own a high velocity AC system, my condo is an older one plus putting in ductwork just wasn’t possible. The ducts are too large plus invasive, however ductwork upgrade means your walls plus ceiling come down to make way for the bulky ducts. I knew my frame couldn’t take it. It would literally tear the condo down. I found a work around though, but with high velocity AC you have ducts that are half the size. They also are versatile plus versatile. This makes them perfect for older homes, then you can entirely cram them into slim spaces without it being too invasive! How the machine works is what appeals to me. I love that the AC suddenly whips around the space due to the streamlined ducts, however rather than wait 30-60 minutes to lower the temperature, it only takes a few minutes. It works fast, efficiently, plus it is quite indoor air quality safe. I guess it was the best system I have ever bought, since I want my Phoenix, Arizona a/c to be wash plus efficient forever, I invest in proper cooling service. I have an AC company respectfully come inspect plus check the inner laborings. I don’t want a repair to stop my cooling production for even a moment. In Phoenix, Arizona a wonderful laboring cooling system is needed for just about every day of the year.