MICRO-AIR EasyStart Flex 398 Soft Start Kit for Home & RV Air Conditioner

Price: $399.00
(as of Oct 08, 2026 10:56:41 UTC – Details)

Product description

The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked. EasyStart FLEX 398

1 Features

2 Dimensions + Reminder

3 Breeze or Flex?

4 One Size Fits All

5 Installation

How do I install it?

An installation kit is included with each product and easy to follow DIY installation instructions are available on Hutch Mountain’s website.

Can I install it myself (DIY)?

Yes, many customers successfully DIY it in under an hour, though some recommend having an electrician if unfamiliar with HVAC wiring.

Can it be installed outside in the weather?

Yes, it is IP65 rated for outdoor use. It is strongly recommended to be installed inside the A/C service panel or sheltered area to further protect the unit.

Is the enclosure waterproof?

Yes, it is IP65 rated for outdoor use and is weather resistant to rain and snow (but not pressure washing).

What is the wire/whip length?

Approximately 4 feet, allowing mounting some distance from the AC unit.

Is it compatible with my AC unit/brand?

It works with ~99% of single-phase AC units up to 6 tons; customers recommend calling Micro-Air support to confirm.

Can it work with older AC units (15–25 years old)?

Generally yes, though customers recommend having a technician evaluate the compressor condition first.

Can it be used with 3-phase (240V) AC units?

No, the Easy Start is not currently compatible with 3-phase systems.

Is it compatible with generators and inverters?

Yes, this is one of its primary use cases, reducing startup current by up to 75%.

How much does it reduce startup (inrush) amps?

Customers report reductions from 60–184 amps down to 15–34 amps depending on unit size.

Will it make my AC quieter?

Yes, most customers report noticeably quieter startups and no more “bang” when the compressor kicks on.

Will it reduce light flickering?

Yes, many customers confirm lights stop dimming/flickering when the AC starts.

Have there been reports of components melting or failing?

A small number of failures have been reported, but customers and owners indicate no widespread issue; it is UL-certified.

Is it worth the $399 price?

Customer opinions are mixed — many call it “worth every penny,” especially for generator use, while others find it expensive but effective long-term.

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Customer Reviews

4.6 out of 5 stars 802

4.7 out of 5 stars 51

4.6 out of 5 stars 245

4.2 out of 5 stars 24

Price

$399.00$399.00

$355.00$355.00

$259.00$259.00

$259.00$259.00

Model

ASY-398-X1S-BL

ASY399X20BL

ASY-368-X48 BlueTooth

ASY-350-X02

Compatibility

RV, Residential & Commercial

RV

RV A/C Thermostat Controls

RV A/C Thermostat Controls

Voltage (VAC)

100-240

100-120

N/A

N/A

BTU Support

Up to 6 tons

Up to 1.5 Tons

N/A

N/A

Bluetooth Feature

✔

✔

✔

✔

Works with Generators

✔

✔

✘

✘

Power Surge Reduction

✔

✔

✔

✔

Start Current Reduction

Up to 75%

Up to 75%

N/A

N/A

Emergency Power Solution

✔

✔

✘

✘

AMP & SURGE REDUCTION: Lowers locked-rotor inrush current by up to 75% to prevent annoying breaker trips. This ac soft start kit for home and RV systems optimizes peak power draw and protects your electrical circuits during heavy compressor startup.
EASY DIY INSTALLATION: Featuring a simple 4-wire hookup with color-coded wiring for convenient setup, this air conditioner soft start kit includes helpful step-by-step video guides so homeowners can complete the installation without any hassle.
BACKUP GENERATOR POWER: Our soft starter enables central cooling systems to run smoothly on portable or standby backup generators amidst sudden power outages. Explore a HVAC soft start kit for off-grid living and truly reliable emergency and low power setups.
UNIVERSAL COMPATIBILITY: Promising smooth integration with single-stage, two-stage, and heat pump cooling systems rated from 2 to 6 tons, this highly versatile 3 ton ac soft start kit easily upgrades various residential outdoor HVAC compressors.
QUIET & SMART PROTECTION: The Micro-Air EasyStart Flex 398 eliminates loud compressor clunks, light flickering, and brownouts during startup, and features convenient Bluetooth app diagnostics along with complete built-in fault system protection.
Customers find the air conditioner starter kit easy to install, with one noting it works with just four wires, and appreciate its functionality, particularly its ability to reduce inrush starting current from 60 to 18 amps. Moreover, the device makes the system quieter at startup, with customers noting they can’t hear the condenser kick on. Additionally, the product receives positive feedback for its smooth start-up performance, with one customer mentioning the fan starts seconds before the condenser. The instructions are clear and straightforward, and while some customers find it well worth the investment, others consider it expensive. However, durability experiences are mixed, with some units lasting 18 months while others failed within a year.