The following Soft Start devices are designed to reduce inrush current, protect compressors, and improve reliability for heat pumps and air conditioning systems. They’re suitable for homes, RVs, generators, and off-grid setups. This guide highlights five top options with clear specs and practical considerations to help readers choose the right kit for their system.
| Product | Brand | BTU/TON Rating | Key Benefit |
|---|---|---|---|
| SoftStart Home – Soft Starter | SoftStartRV By NetworkRV | Up to 72,000 BTU / 6 Ton | Reduces startup power up to 70% |
| EasyStart Flex 398 | MICRO-AIR | Up to 72,000 BTU / 6 Ton | Gentle, controlled start; up to 75% startup current reduction |
| AIRGO AC Soft Starter | AIRGO | 1.75 – 3.5 Ton range | Reverse motor protection; easy DIY install |
| Hyper Engineering Soft Starter | Hyper Engineering | 5 – 7 Ton units | Large inrush reduction; protection against low voltage start |
| Coleman-Mach Soft Start Kit | MAXXAIR | Coleman-Mach series 1497-3601 | 75% reduction in startup amperage; ramped startup |
SoftStart Home – Soft Starter For A/C & Heat Pumps
SoftStartRV’s SoftStarter for air conditioning and heat pumps reduces inrush current by up to 70%, enabling quieter starts and smoother operation. It is designed to extend compressor life by minimizing startup heat buildup. The device works reliably with generators, RV power systems, and solar setups, making it suitable for off-grid or backup power scenarios. Install time is approximately 15 minutes, and the unit supports systems up to 6 tons (72,000 BTUs). The technology minimizes startup shocks and flicker, which helps protect electrical components in imperfect power conditions.
MICRO-AIR EasyStart Flex 398
EasyStart Flex 398 from MICRO-AIR combines advanced microprocessor control with a complete installation kit. It supports home, RV, and commercial applications up to 6 tons, offering a controlled, gentle startup that reduces mechanical stress and extends the system’s lifespan. It’s designed for compatibility with generators and inverters, reducing startup current by up to 75%, which helps maintain operation in power-constrained or off-grid environments. The kit includes the necessary hardware for straightforward installation and reliable performance across multiple compressor configurations.
MICRO-AIR EasyStart FLEX 398
EasyStart Flex 398 with Bluetooth offers flexible control and monitoring for home, RV, and commercial systems up to 6 tons. The device reduces startup surge and provides a smooth ramp to running voltage, helping prevent compressor stall and voltage dips. It is engineered to work with generators and inverters, making it suitable for off-grid or power-limited locations. Its compatibility with 2-stage compressors and heat pump configurations broadens its applicability for varied HVAC setups.
AIRGO AC Soft Starter
AIRGO’s Soft Starter offers reverse motor protection and a compact, DIY-friendly installation that fits inside many air conditioning units. It is designed for residential units in the 1.75-3.5 ton range, with a focus on gentle ramp-up to reduce mechanical strain on the compressor at startup. The kit includes a wire harness and hardware, enabling quick setup. It aims to improve longevity and reliability by smoothing startup transients in typical utility and generator power environments.
Hyper Engineering Soft Starter SS1B16-32SN
The Hyper Engineering SS1B16-32SN is rated for 5-7 ton HVAC units and reduces locked rotor amperage (LRA) and inrush current by up to 70% at startup. This helps eliminate light flicker and reduces startup noise, while protecting the compressor from stall at low voltages. A built-in delay function limits the number of motor starts per hour, supporting longer equipment life and better performance during power fluctuations or outages. It is particularly suitable for use with generators during emergencies or outages.
Coleman-Mach Soft Start Kit
MaxxAir Coleman-Mach Soft Start Kit reduces startup amperage by up to 75% and is designed for Coleman-Mach air conditioners and heat pumps. It uses a ramped power draw at startup to progress slowly toward running voltage, minimizing voltage spikes. The unibody enclosure protects the kit during outdoor exposure, and installation from the exterior of the coach is possible, preserving exterior appearance. This kit aims to extend outdoor unit life by lowering startup stress on the compressor.
Buying Guide
Key purchase considerations include system compatibility, installation complexity, and power source constraints. When choosing a soft start solution for a heat pump or air conditioner, consider:
- System tonnage compatibility: Ensure the device supports your unit’s size (tonnage) and compressor type, especially two-stage models or heat pumps.
- Power source and reliability: If you rely on generators, inverters, or solar, verify the soft start’s performance with limited or unstable power.
- Inrush reduction and impact on appliances: A higher inrush reduction generally means quieter starts and less electrical stress, but check if the feature affects startup timing or cycling.
- Installation effort: Some units require inside-unit wiring and external kits; others are plug-and-play with minimal wiring. Consider DIY comfort and warranty implications.
- Protection features: Look for reverse motor protection, delay functions, and protections against stall to extend compressor life.
- Cost vs. lifespan: Weigh upfront kit costs against potential savings from fewer compressor failures and longer equipment life.
Overall, these options provide varied approaches to soft-starting: some prioritize simple DIY installation for common residential units, while others target larger heat pumps and off-grid setups. For homes with frequent power incursions, inverters, or generator use, a high inrush reduction and robust protection can contribute to more reliable climate control and lower electrical stress.