I AM OBSESSED! We live in a 3800 sq ft home and I have The Villa (favorite!) much covers well my kitchen, living room, dining room and laundry rooms. I added 2 Penthouse units - or in our master and one at our Foyer. We just finished a whole house remodel and when we moved back in and I plugged in my units, those nasty construction smells went right away. O constant get asked how do I keep my house smelling so good, and I immediately share the wonders of your product! They are so effective and keep my house smelling device. If anyone has the capabilities of purchasing th one that hooks up to you AC, DO NOT DOUBT IT OR HESITATE. I am in the process of doing it in my house. I am so glad all the plug-ins, candles and reed diffusers are gone; trying to match scents, constant changing out these products. Now that I have these diffusers, I am OBSESSED and recommend you invest it one - it will blow your guests away! Also, I have given 4 as wedding gifts and all the couples are hooked to! It is a MUST in everyone’s living quarters!