Purchased two Sierra 3400 fans, I have used them in the past and love them. Both fans arrived in good condition BUT neither one had installation instructions in the boxes. Fortunately I was in an area where I could get internet access and downloaded the instructions on my phone but what a pain to try to see the little instructions on the phone, otherwise would have given 5 stars.

Having owned 2 previous homes with more traditional whole house fans, we knew we loved having them. Have to admit when we got the quote from our local installers we were a little surprised by the higher price than we've paid in the past, even accounting for 20 years of inflation :)

But though we've only had to use it a couple of months, absolutely loving it. Get the remote if you have multiple floors - just too convenient and it works well. We run this thing all night and it's downright cold in our house by morning here in NoCo where the nights get down to 50s even with days in the 90s. But does a nice job of preventing that A/C from kicking on. Since only had it a small time, can't say quantitatively how much less the A/C is running or what our electric cost differences might be.

The 4300 is model we have for a 3000sq foot house, with a lot of vaulted ceilings, so pretty huge volume of air. Usually run this around speed 4-5, but even when we kick it up to 10, it's nice and quiet and the airflow is impressive.

Might take 5-7 years to recover cost relative to cheaper style, but I think that the extra cost for the quiet, quality, and speed adjust-ability will be worth it.

As a residential and light-commercial energy-efficiency contractor, I am speaking from experience when I say the product and the company couldn't be better. I know the upfront costs is not cheap, but here's why this is the only brand we install...

Most importantly to us, reliability and longevity...we never have call backs, every component lasts and lasts. We've had to replace just one damper-door motor after installing 25 - 50 of these a year, for the past 10-years.

They are absolutely the quietest and most efficient unit on the market, which enables the customer to run the fan "all night long". We've done the math; in Northern Colorado and they operate at roughly 100 SEER, which is about 7-times more efficient than running the air-conditioner.

Air conditioning is expensive and consumes too much energy. In our hot-dry climate, the fans will pay for themselves in about 5-years from savings on the electric bill.

I am in this business because I wanted to make a positive impact in the fight against climate change, and I get a great deal of gratification every time I sell and install one of these "Emission Mashing Machines". Seriously, that's what I call them.

Lastly, as an approved installer, I want to say that the customer support/back-office people are also top-notch.

To everyone at Airscape,

We Appreciate Ya and Keep Up the GOOD Work!

Mike Truitt, This Efficient House, Fort Collins, CO

Other than testing the unit prior to and after installation I have not used it. Very happy with my purchase though. I am a general building contractor and did the install.

Assembly was simple. Ran just a little short of sealing tape