MICRO-AIR EasyStart FLEX 398 - Bluetooth Soft Start Kit for Home Air Conditioner, RV & Commercial Use, Works with Generators, Reduces Power Surge, Efficient Start-Up - Up to 6 Tons

I run two geothermal heat pumps - one 6 tonne and the other is 3 tonne. No more harsh startup sounds or light flickers on startup. On first startup in learn mode saw 66% reduction in startup current.

Bought this several years ago cause wanted to put a soft start on ac for a generator use. Saw this on a YouTube video had good reviews and install was easy. So for the last couple years I had it on my ac. No issues so far and the ac start up is a lot quieter and hopefully less wear on compressor. It’s Bluetooth so I get feed back on my ac unit and if I ever need help can call the company and see what the issue is. But so far it’s been good.

With all the research I did, this item was rated very well. Everything was as described with good instructions and easy setup. I had a substantial decrease in inrush amps (starting amps) once the FLEX 398 was installed and it learned my compressor. Before installation my inrush amps was 89.9 amps. This unit reduced my inrush amps to 20.1 amps. Excellent quality and performance.

I bought this soft start kit for my sons A/C system. I watched many videos online and looked for the best one. When I found a video of a guy putting this exact one on his A/C it looked to easy and appeared to work great. So, I tried it out. My A/C was a different brand than what he installed it on. However, it was almost identical in the installation procedure and was by far the easiest one I saw. I think the overall installation was about 15 minutes. There were no special tools needed and it mounted behind the cover plate just fine. We started it up and measured the amps after installation and it was drastically reduced. The reason we did a soft start was due to power failures and his generator not starting the A/C compressor. He has a 11,000 watt generator with a 12,000 watt start. It struggled to start the A/C. After installing the soft start, it started the A/C with no problem and continued to run along with 2 refrigerators and fans in the house. A little piece of security now when the hurricanes come and power is out. I would highly recommend spending the money on this particular one. It may be a little more but is well worth the ease of installation and the fact that it works with no problem. Just my opinion.

Very pleased! I do suggest changing your capacitor when you add anything like this to your HVAC system. They do go bad just like light bulbs or batteries as an example. Also make sure all connections are secure as this will cause failure on many components. Installation ease will vary on units. Following the instructions is a must. If you’re not sure have a licensed electrician/HVAC technician do this for you. My 4 ton unit had a 98 amp inrush, now after it’s 26 amp after EasyStart learning curve (chose to do the 7 starts). This is an efficient energy savings. Had no problems with my Heat pump prior to installation of the EasyStart except with my 13000 watt generator. The generator will now start my system from eco mode. Size of the EasyStart forced me to mount externally. If you mount it with screws, exercise caution so you don’t drill or run a screw into any components behind it. Please don’t add this to your unit if you have a problem as this is a start assist device. It will probably help to some degree but can’t fix preexisting problems and will have the potential to damage your EasyStart. When the unit starts now on commercial power, I have no flickering lights in my house (been that way since it was installed). Slightly lowered my running amps. So, between inrush and running amps I believe it’s a good value for the money. Take amperage readings before and after to see for yourself. Downloaded the app and compared its readings to Fluke meter. Pretty much spot on. Time will tell the rest. Hope this helps with your decision to purchase.