Best AC Soft Start Kit for Home and RV Use
Choosing the right AC soft start kit can protect your compressor, reduce inrush current, and help your power source manage startup surges. The following five kits are among the top-rated options for American homes and RV setups, offering compatibility with generators, inverters, and solar power while delivering smoother, quieter starts. Each entry includes an overview of its strengths, installation notes, and how it stacks up for different uses.
The table below provides a quick comparison of the five selected kits, including capacity, typical use case, and standout benefits. Use it as a starting point to identify which kit best matches your AC system, power source, and typical environment.
| Product | Brand | Capacity | Best For | Highlights |
|---|---|---|---|---|
| MICRO-AIR EasyStart Flex 398 | MICRO-AIR | Up to 6 tons (72,000 BTU) | Home, RV, Commercial | Up to 75% startup current reduction; installation kit included |
| SoftStartRV Soft Start for RV A/C | SoftStartRV By NetworkRV | RV A/C up to roughly 36,000 BTU (dual A/C on 30A) | RVs, trailers, motorhomes | Smaller footprint; waterproof; powers multiple appliances |
| SoftStart Home Soft Starter for A/C | SoftStartRV By NetworkRV | Up to 6 tons (72,000 BTU) | Home, RVs, solar | 70% startup current reduction; 15-minute install |
| Coleman-Mach Soft Start Kit | MAXXAIR | Matches Coleman-Mach series units | All Coleman-Mach air conditioners and heat pumps | Up to 75% startup amperage reduction; exterior-friendly enclosure |
| MICRO-AIR EasyStart Breeze 399 | MICRO-AIR | 13k–15k BTU RV A/C; supports two on 30A | RV travel trailers, small RV setups | Compact, quiet starts; works with 2200W generator |
MICRO-AIR EasyStart Flex 398
The MICRO-AIR EasyStart Flex 398 is a versatile soft start kit designed for residential AC units up to 6 tons (72,000 BTU). It delivers a controlled, gentle startup, reducing mechanical stress and extending compressor life. The kit includes an installation package, making it suitable for both homes and commercial applications. It is engineered to work with generators and inverters, cutting startup current by up to 75%, and is compatible with 2-stage compressors and heat pumps. Installation is straightforward with the included hardware and wiring guidance.
- Reduces startup current by up to 75%.
- Supports up to 6 tons (72,000 BTU) systems.
- Compatible with generators and inverters.
- Suitable for 2-stage compressors and heat pumps.
- Installation kit included for easy setup.
SoftStartRV Soft Start for RV A/C
SoftStartRV’s RV soft start kit is designed for low-profile A/C units and can start a rooftop unit from modest power sources. The kit is 40% smaller to fit compact RV A/C setups and can start dual A/Cs on a 30-amp hook-up or one on a small generator, with a 15-amp option. It is 100% waterproof and claims to reduce starting current by 65–70%, minimizing noise and vibration. The system supports a generator as small as 2200W, powering up to 36,000 BTU, including a 15,000 BTU rooftop A/C, making it a practical choice for many RV layouts.
- 40% smaller design to fit low-profile RV A/C units.
- Start two A/Cs on 30-amp; one on a small generator; 15-amp option available.
- 100% waterproof construction.
- Reduces starting current by up to 65–70%.
- Compatible with 2200W generators, powering up to 36,000 BTU.
SoftStart Home Soft Starter for A/C
SoftStart Home delivers advanced soft-start technology for smooth, quiet A/C startup. By reducing startup current by up to 70%, it helps prevent flickering lights and voltage dips, safeguarding home electrical systems. It’s designed for use with generators, RVs, and solar power, ensuring reliable operation during blackouts or off-grid scenarios. The kit positions easily on standard residential units and can extend compressor life by reducing heat buildup during startup. A typical installation is around 15 minutes, depending on unit compatibility.
- Reduces startup current up to 70% for smoother operation.
- Extends compressor life by lowering startup stress.
- Compatible with generators, RVs, and solar power.
- 15-minute installation estimate.
- Effective across a range of A/C and heat pump setups.
Coleman-Mach Soft Start Kit For ALL Coleman-Mach
The Coleman-Mach Soft Start Kit is designed to reduce startup amperage for Coleman-Mach air conditioners and heat pumps by up to 75%. It uses a ramped startup approach to minimize voltage spikes and employs short-cycle protection to extend unit life. The kit features a unibody enclosure that protects the unit in varying weather conditions and does not alter exterior aesthetics. Installation is straightforward from the exterior of the coach, making it a favorable option for travelers and RV owners with Coleman-Mach systems.
- Reduces startup amperage by up to 75%.
- Specifically designed for Coleman-Mach series units.
- Unibody enclosure protects the kit in harsh conditions.
- Exterior installation preserves interior aesthetics and access.
- Short-cycle protection enhances overall system life.
MICRO-AIR EasyStart Breeze 399
The MICRO-AIR EasyStart Breeze 399 targets RV air conditioners with 13k–15k BTU capacity, offering a compact design and installation kit. It is suitable for running a single 13k–15k BTU unit on a 2200-watt generator, and can support two A/C units on a 30-amp supply when used with another Breeze 399. The Breeze 399 delivers quieter startup and smoother compressor engagement, benefiting comfort in RV environments where space and weight matter.
- Supports RV A/Cs up to 13k–15k BTU; compatible with 2200W generators.
- Two A/Cs on a 30-amp supply when used with two Breeze 399 kits.
- Compact design for easier installation.
- Quieter, smoother compressor starts.
- Includes installation kit for convenient setup.
Buying Guide
When selecting an AC soft start kit, consider your unit size, power source, and installation environment. Home systems typically require higher capacity kits to handle up to 6-ton air conditioners, while RV setups emphasize compactness and compatibility with limited power sources and generator sizes. Generators, inverters, and solar power differ in how much startup current you can safely draw; choose a kit that minimizes inrush while staying within available amperage. Durability and weather resistance matter for outdoor condenser boxes or exterior installs. Finally, verify compatibility with heat pumps, dual A/C configurations, and existing Coleman-Mach or other branded units if applicable.
Key purchase considerations
- System size and capacity: match the kit to your AC’s BTU/ton rating to ensure effective soft-start performance without under-sizing.
- Power source compatibility: assess whether you use a generator, inverter, or solar array and select a kit that minimizes startup current accordingly.
- Installation complexity: some kits include full installation kits and clear wiring guides; others may require professional assistance.
- RV vs. residential use: RV kits are typically more compact and designed for limited power sources, while home kits may support larger units.
- Durability and weatherproofing: exterior-rated enclosures and waterproof designs improve longevity in harsh environments.
- Warranty and support: check manufacturer coverage and ease of obtaining replacement parts.
- Noise reduction and comfort: quieter starts reduce vibrations and improve living conditions during startup.
Quick comparisons for common scenarios
- Best for large home systems up to 6 tons: MICRO-AIR EasyStart Flex 398 offers robust capacity and easy installation with a full kit.
- Best for RVs with compact spaces: SoftStartRV and Breeze 399 provide small-footprint, quiet operation with generator compatibility.
- Best for Coleman-Mach owners: Coleman-Mach Soft Start Kit reduces amperage without altering exterior aesthetics.
- Best for general home use with heat pumps: SoftStart Home delivers strong startup current reduction and broad compatibility.