--- product_id: 4041344 title: "CPS 5-2-1 CSRU1 Compressor Saver for 1 to 3 Ton Units" price: "961 kr" currency: NOK in_stock: true reviews_count: 8 url: https://www.desertcart.no/products/4041344-cps-5-2-1-csru1-compressor-saver-for-1-to store_origin: NO region: Norway --- # Reduces high amp start-up time Saves money by extending compressor life Multi-layer starting capacitor for power boost CPS 5-2-1 CSRU1 Compressor Saver for 1 to 3 Ton Units **Price:** 961 kr **Availability:** ✅ In Stock ## Summary > ⚡ Power up your A/C start with smart savings! ## Quick Answers - **What is this?** CPS 5-2-1 CSRU1 Compressor Saver for 1 to 3 Ton Units - **How much does it cost?** 961 kr with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.no](https://www.desertcart.no/products/4041344-cps-5-2-1-csru1-compressor-saver-for-1-to) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Swift Power Boost:** Cut compressor start-up amps and protect your system instantly. - • **Professional Grade:** Designed by technicians for technicians, ensuring top-tier performance and durability. - • **Smart Start Technology:** Integrated multi-layer capacitor and smart switch ensure reliable, efficient compressor activation. - • **Cost-Effective Protection:** Prevent costly compressor replacements with an affordable saver that extends equipment lifespan. - • **Plug & Play Compatibility:** Fits 1 to 3 ton A/C units seamlessly, making upgrades hassle-free and future-proof. ## Overview The CPS 5-2-1 CSRU1 Compressor Saver is a compact, professional-grade device designed to reduce compressor start-up amps for 1 to 3 ton A/C units. Featuring a multi-layer starting capacitor and smart switch, it enhances compressor reliability, lowers power draw, and extends equipment life—offering an affordable alternative to costly compressor replacements. Installation by a licensed technician is recommended. ## Description CPS 5-2-1 CSRU1 Compressor Saver for 1 to 3 Ton Units - Hvac Controls - desertcart.com Review: Great to revive a tired, worn compressor - My a/c unit is getting old. The compressor is weak and beginning to drag on start-up, drawing more amps than the breakers can handle. All last year, house lights would dim when the compressor kicked on and by the end of summer last year the circuit breakers began to trip at start-up. I called my HVAC guy and he came out and put on a small 2 wire hard start kit which cost $100 for the kit and $75 dollars for installation. It got my a/c working again , but by mid winter my heat pump quit working and we were forced to heat the house with the back-up electric heat strips in the furnace. Needless to say our electric bill was twice what it would have been had the compressor worked for the heat pump but we were in the middle of winter and there was no way we could afford a new system. This year I called around to get estimates on a new a/c unit and after recovering from the shock of what it was going to cost, I decided to try one more attempt to get my compressor starting again. I pulled off the $175 hard start kit only to discover it was burned to a crisp. When I installed the new 521 hard start kit, my compressor fired right up... no lights dimmed ... no breakers tripped, and it's been running perfect for almost three months now. This is a great product, very heavy duty with great build quality and cost a fraction of what I paid a "Professional" last year. I ordered it from desertcart and installed it myself. Installation was super easy. Instructions were good, but for additional reassurance, I watched a couple of videos. A/c compressors don't last forever and eventually they will have to be replaced. If your unit hasn't locked up yet , these 521's may be a life-saver and buy you some time. They could maybe even fix the problem all together until it becomes someone else's problem further down the road. WELL worth the money and I will buy again if needed. Review: Removes hvac industry license to scam and steal - Works great on my trane x12. It literally saved me at least $10,000. Hvac servicemen told me to replace the locked compressor with a new unit. Due too having to use a new type freon because of global warming it would have to be a new furnace also. So they tell you you can't fix it and you must spend 10k to replace it. Well fortunately with advice from a family member, a little you tube research and desertcart this fixed the compressor start up. 5 minutes to plug in and mount. Took away hvac industry scam license to steal for now. ## Features - BOOST START-UP: A 5-2-1 Compressor Saver significantly reduces the amount of time your compressor is on high amp start-up. Some top-of-the-line A/C units come from the factory with 5-2-1 technology built in. Now you can have a 5-2-1 Compressor Saver installed in your A/C unit by a professional! - THE RELIABLE CHOICE: The compression savor uses a powerful multi-layer starting capacitor and a smart switch to give your compressor the boost it needs to start up quickly, more reliably, draw less power and save you money, too - AFFORDABILITY: The cost of a 5-2-1 Compression Savor is a fraction of the cost of replacing a compressor damaged by hard starts. It could add years to the life of your compressor and other electrical components associated with your A/C system - ADDITIONAL INFORMATION: This product should only be installed by a licensed technician - ABOUT US: CPS Products is a business built by technicians, for technicians. We design Tools for the Professional Service Technician. With the world’s most comprehensive range of Leak Detection technologies, Smart Diagnostic tools, and proven Maintenance Solutions, CPS Products has been The Workingman’s Choice since 1989 ## Technical Specifications | Specification | Value | |---------------|-------| | Manufacturer | Five Two One Inc | | Part Number | CSR-U1 | | Item Weight | 0.8 ounces | | Product Dimensions | 0.1 x 0.1 x 0.1 inches | | Item model number | CSR-U1 | | Is Discontinued By Manufacturer | No | | Size | 1-2-3 Tons | | Color | Black / Red | | Style | Portable | | Material | Plastic | | Power Source | Corded Electric | | Voltage | 0.1 Volts | | Item Package Quantity | 1 | | Type of Bulb | CSRU1 | | Special Features | Compressor Saver | | Included Components | Compressor Saver, multi-layer starting capacitor, smart switch, color-coded wires | | Batteries Included? | No | | Batteries Required? | No | ## Images ![CPS 5-2-1 CSRU1 Compressor Saver for 1 to 3 Ton Units - Image 1](https://m.media-amazon.com/images/I/51uR1I9zNJL.jpg) ![CPS 5-2-1 CSRU1 Compressor Saver for 1 to 3 Ton Units - Image 2](https://m.media-amazon.com/images/I/61H6YBVEfgL.jpg) ![CPS 5-2-1 CSRU1 Compressor Saver for 1 to 3 Ton Units - Image 3](https://m.media-amazon.com/images/I/51LrAKsUTgL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Great to revive a tired, worn compressor *by R***. on September 5, 2014* My a/c unit is getting old. The compressor is weak and beginning to drag on start-up, drawing more amps than the breakers can handle. All last year, house lights would dim when the compressor kicked on and by the end of summer last year the circuit breakers began to trip at start-up. I called my HVAC guy and he came out and put on a small 2 wire hard start kit which cost $100 for the kit and $75 dollars for installation. It got my a/c working again , but by mid winter my heat pump quit working and we were forced to heat the house with the back-up electric heat strips in the furnace. Needless to say our electric bill was twice what it would have been had the compressor worked for the heat pump but we were in the middle of winter and there was no way we could afford a new system. This year I called around to get estimates on a new a/c unit and after recovering from the shock of what it was going to cost, I decided to try one more attempt to get my compressor starting again. I pulled off the $175 hard start kit only to discover it was burned to a crisp. When I installed the new 521 hard start kit, my compressor fired right up... no lights dimmed ... no breakers tripped, and it's been running perfect for almost three months now. This is a great product, very heavy duty with great build quality and cost a fraction of what I paid a "Professional" last year. I ordered it from Amazon and installed it myself. Installation was super easy. Instructions were good, but for additional reassurance, I watched a couple of videos. A/c compressors don't last forever and eventually they will have to be replaced. If your unit hasn't locked up yet , these 521's may be a life-saver and buy you some time. They could maybe even fix the problem all together until it becomes someone else's problem further down the road. WELL worth the money and I will buy again if needed. ### ⭐⭐⭐⭐⭐ Removes hvac industry license to scam and steal *by R***L on May 6, 2026* Works great on my trane x12. It literally saved me at least $10,000. Hvac servicemen told me to replace the locked compressor with a new unit. Due too having to use a new type freon because of global warming it would have to be a new furnace also. So they tell you you can't fix it and you must spend 10k to replace it. Well fortunately with advice from a family member, a little you tube research and amazon this fixed the compressor start up. 5 minutes to plug in and mount. Took away hvac industry scam license to steal for now. ### ⭐⭐⭐⭐⭐ Installed reasonably easily, had a measurable impact *by S***N on August 6, 2020* I installed this in a 2002 2.5 ton Trane heat pump that had not been exhibiting starting issues. At this age, I don't expect the heat pump to last much longer, but for the price it was cheap attempt to try prolong it's life. Install was reasonably straightforward. My contactor had been replaced previously, and the new one was installed upside-down. Even if it was installed per the wiring diagram on the unit, the compressor common would have been on T2 instead of T1 like the instructions call for. There was an envelope of documents attached to the box that had the wiring diagram; as always before doing any work I compared the diagram to what was actually in the unit, finding and tracing the compressor wires to determine the appropriate places to connect the 5-2-1. My only other installation complaint was that the screws provided were a little long (certainly longer than the stock screws holding the other components in my unit). My unit had holes pre-drilled and taped over, but I was concerned that if I used them the extra screw length would interfere with the coils. No huge deal here either, there was room at the very top of the wiring compartment to drill a couple new holes that were safely above the coils. Before installing the 5-2-1 kit I measured the inrush current on the compressor common wire, and got a value of 33.6A. I repeated the test after installing the kit and got 25.9A. In more subjective measures, the compressor startup time and sounds seem to be reduced; it just clicks on to the steady hum right away now, instead of seeming to take maybe a half-second to come up to speed. Overall, I would definitely recommend this kit (or the others from 5-2-1 as appropriate for your unit size). Just make sure to trace wires and compare with the diagram, instead of blindly following the instructions from the kit. I don't knock 5-2-1 for this; they're doing their best to support decades of equipment from a wide variety of manufacturers, and there's always going to be an oddball. Same with the provided screws; they'll probably work without issue for most people. Just use your head during installation, and check for clearance behind the mounting locations before doing any screwing or drilling. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.no/products/4041344-cps-5-2-1-csru1-compressor-saver-for-1-to](https://www.desertcart.no/products/4041344-cps-5-2-1-csru1-compressor-saver-for-1-to) --- *Product available on Desertcart Norway* *Store origin: NO* *Last updated: 2026-09-16*