SPP6 Hard Start Capacitor Replacement 115V Thru 288VAC Hard Start kit for air Conditioner Units from 4,000 to 120,000(1/2 Thru 10H.P.),Increases Compressor Torque 500% by AMI PARTS

This hard start kit worked well for my AC unit and the price was very reasonable compared to other options. Installation was straightforward and the product feels solid for the cost. After installing it, the compressor started more smoothly and seemed to have better starting power.

Works great on older AC compressor/condensor units that benefit from that extra start torque this provides. Easy install.

Work fine last long time. Easy to install.

Quick delivery which was helpful with the crazy heat wave. The compressor was not kicking on, but the fan was working fine. I keep a spare capacitor on hand as they are cheap and the usual cause of AC units not to function. However, on this case the capacitor was fine. A friend in the AC repair field told me about these hard starters and at $15 I considered it a safe bet. Easy to hook up, please search the internet for some instructions on installation. Three days now of a working AC unit without a service call!! Update 07/22/2025 Still going strong!! Buying an extra one to sit on the shelf in the garage in case anything happens in the future. Small investment for having the AC down for just a few minutes.

Worked as described, arrived quickly

***UPDATED REVIEW*** You will note that they sell this in a multi-pack. Get the multipack. First one worked great for 14 months...and then completely stopped working. Replaced the SPP6 and back in action. It really works great and does what my compressor needed, but you will save yourself some eventual heartache if you get the multi-pack. Original Review Below: My Florida Heat Pump (now owned by Bosch) compressor was failing to start when the system commanded it to start. It would hum for about 5 seconds and then time out. This cycle would repeat over and over, sometimes starting and sometimes the system seemed to quit trying (after about ten minutes and 50 or so failed starts of the compressor). Anyway, this piggy back capacitor is simply added in parallel to the existing capacitor and it works like a champ. Two things to note: (1) capacitors can zap you even when you've removed the 220Vac at the breaker...you must discharge the existing capacitor or you'll become the discharge path and that's gonna hurt... and (2) it's possible you just need to replace your existing capacitor and this boost is unnecessary. If your compressor is older and a capacitor swap didn't fix your problem, this is the easy button you were hoping for. As for how long this bandaid fix will last, I dunno, but, at the price of a new compressor, this thing will pay for itself in about a month or two.

Easy installation

This was a little different than what my RV air conditioner had on it. I couldn’t find that style anyway, and I decided to go with us and try it. It worked perfectly. Dealer said they don’t make those anymore and you have to change out the whole air conditioner. Nope.