The unit met the needs of the room it was installed in. Heater is a compact easy to maintain unit that will serve it's purpose well.

This Sterling GG60 is a good value and is very well constructed. I initially intended to install a Hot Dawg heater which I have used in other applications and decided to try this lower cost alternative. This worked out excellent and I would rank the quality of this heater slightly above the Hot Dawg, even though they are good product as well. Net was I saved a few bucks and got a better unit. The service from ACF Greenhouse has also been outstanding. Keep up the good work.

GG60 Sterling Heater, First one came had some damage called ACF and Eric had company come back same day and pickup and ordered new one. Received new one about a week later! Product is made very well, Have not hooked up to gas yet still waiting on propane company to run line. Just want to say if you are looking for company to buy online with ACF is the best! ERIC and is staff handled any question or problem like a pro. When you call them they answer phone. Thanks to Eric and Staff

ACF Greenhouse took care of me from a customer service stand point. 5-stars for them!

I oreded the high altitude, 2 stage version of the GG60, which shipped from the factory. My order got 'misplaced' at the warehouse in Denver, CO. After 2 weeks I called ACF Greenhouse and they found my heater and got it moving. The heater did not come with the louvers in the box. Again, called ACF Greenhouse and they got a set sent.

Upon visual inspection before installation, one of the pin on the circuit board for the status light missed the plug clip, I corrected this. After a frustrating two days of troubleshooting my thermostat, I found the 2-stage gas valve had not been wired correctly. Clearly this unit was not function tested at the factory. I'm a DIY guy with limited experience regarding HVAC systems and at this point I'm fearful there may be other problems my inexperience is missing.... Fingers crossed.

just installed this heater and is working great after I had to reattach the fan blade that was just hanging there.

Well-constructed, nice heater. Easy to hook up, adjust and works very well for my 4000 square foot shop. AFC was great to work with, shipping was right on time and no damage.

This is my second GG heater, and I bought it because the first one did so well. Both have been installed in freestanding woodworking shops. The first one I had 6 years before we moved, and this one I've had 7 years now. My only complaint with the second one is the control board went bad after 6 years. I expect these things to fail occasionally and that isn't specifically my complaint, but the replacement cost $500, 70% of what i paid for the furnace. Even so, I thing the GG line of furnaces are as good as this type can be and I recommend them.

ACF Greenhouses: I'm sorry to hear you had an issue with your heater and wish you had asked us about purchasing a replacement board because we sell them for half that price. I hope the new unit gives you many years of trouble-free operation!

High quality and fit was also good, I've used it now thru the 2018 winter and has worked very well it's very quiet compared to my 60,000 BTU one I had before this one.