---
product_id: 666792622
title: "MICRO-AIR EasyStart FLEX 398 - Bluetooth Soft Start Kit for Home Air Conditioner, RV & Commercial Use, Works with Generators, Reduces Power Surge, Efficient Start-Up - Up to 6 Tons w/Installation Kit"
brand: "micro-air"
price: "HK$5074"
currency: HKD
in_stock: true
reviews_count: 6
category: "Micro Air"
url: https://www.desertcart.hk/products/666792622-micro-air-easystart-flex-398-bluetooth-soft-start-kit-home
store_origin: HK
region: Hong Kong
---

# 75% startup current reduction Bluetooth app control 35dB ultra-quiet operation MICRO-AIR EasyStart FLEX 398 - Bluetooth Soft Start Kit for Home Air Conditioner, RV & Commercial Use, Works with Generators, Reduces Power Surge, Efficient Start-Up - Up to 6 Tons w/Installation Kit

**Brand:** micro-air
**Price:** HK$5074
**Availability:** ✅ In Stock

## Summary

> ⚡ Start smart, stay cool, and never miss a beat with EasyStart FLEX!

## Quick Answers

- **What is this?** MICRO-AIR EasyStart FLEX 398 - Bluetooth Soft Start Kit for Home Air Conditioner, RV & Commercial Use, Works with Generators, Reduces Power Surge, Efficient Start-Up - Up to 6 Tons w/Installation Kit by micro-air
- **How much does it cost?** HK$5074 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hk](https://www.desertcart.hk/products/666792622-micro-air-easystart-flex-398-bluetooth-soft-start-kit-home)

## Best For

- micro-air enthusiasts

## Why This Product

- Trusted micro-air brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Power Surge Slayer:** Slash startup amps by up to 75%, protecting your generator and grid.
- • **Whisper-Quiet Start:** Experience near-silent compressor startups at just 35 decibels.
- • **Smart Bluetooth Control:** Monitor and manage your AC startup effortlessly from your phone.
- • **Versatile Compatibility:** Works seamlessly with home, RV, and commercial AC units up to 6 tons.
- • **Compact DIY-Friendly Design:** Half-size enclosure fits tight spaces with easy, professional or DIY installation.

## Overview

The MICRO-AIR EasyStart FLEX 398 is a cutting-edge Bluetooth-enabled soft start kit designed for residential, RV, and commercial air conditioners up to 6 tons. It reduces startup current by up to 75%, enabling smooth operation on generators and limited power sources while minimizing mechanical stress and noise. Its compact design and smart app control make installation and monitoring effortless, extending your AC system’s lifespan and ensuring reliable, energy-efficient cooling even during power fluctuations.

## Description

Buy MICRO-AIR EasyStart FLEX 398 - Bluetooth Soft Start Kit for Home Air Conditioner, RV & Commercial Use, Works with Generators, Reduces Power Surge, Efficient Start-Up - Up to 6 Tons w/Installation Kit: Air Conditioners - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Performs as Advertised! Good Value! Easy Install. Real World Performance! - EDIT: I installed this item one week ago today. It has worked as advertised. While returning from running errands this morning I received a notification on my phone that the power was out at the house. The first real world opportunity to see if this piece of kit is worthy of the cheddar. I arrived home in about 10 minutes and confirmed much of the neighborhood was out. It's hot, DAMNED HOT, outside today and this will never do! It took about 15 minutes total time to get the gennie up and running and arrive at the moment of truth. I flipped the breaker for the gennie and powered the panel, then energized the furnace circuit (Ecobee thermostat controls), then energized the A/C circuit and waited. It took right at 2 minutes for the Ecobee to come online (wifi is on UPS) and call for cool. The fan on the A/C started first, seconds later the compressor started, the gennie shouldered the load like a CHAMP, and the A/C was running! I energized the rest of the circuits according to my emergency power plan and monitored cycle performance in cool air conditioned comfort. "I love it when a plan comes together!", Colonel John "Hannibal" Smith. Purchase with confidence! OE Review... Meets and exceeds expectations. Simple, straightforward four wire installation. Easy enough for a handy DIYer. They even have a short YouTube instruction video! I purchased this so I could have AC when the power goes out. I have a 4 ton HVAC that drew 106a inrush before installation. Too much for a modest portable generator in a power outage. After 6 learning cycles it only pulls 26.xxa! A bona fide 75% reduction in startup draw! It’s also much quieter now too. I highly recommend!
Review: Great product. Exactly what I needed to run my house from my generator. - I purchased this to reduce the starting load from my AC unit so I can run my house on my backup generator. I'm a very technical/handy person and found the installation instructions very easy to understand. I don't think you need to be very technical/handy to install this device. The installation was quick. The product works GREAT. Prior to install, my AC would not start on generator power. Now it all starts and I'm ready for the next storm. Great product!

## Features

- ADVANCED MICROAIR TECHNOLOGY WITH INSTALLATION KIT: Micro-Air EasyStart Flex is the most advanced and versatile soft starter, designed for all sizes of residential AC units up to 6 tons (72,000 BTUs). It provides a controlled, gentle startup that reduces mechanical stress, extending your AC system’s lifespan. This air conditioner soft start kit includes everything needed for an easy installation, making it an optimal choice for home and commercial applications.
- IDEAL FOR HOME,RV AND COMMERCIAL USE: Perfect for residential and commercial settings, the EasyStart Flex HVAC soft start kit efficiently supports AC systems up to 6 tons, making it versatile for various applications. Designed for compatibility with generators and inverters, it provides an easy start for home AC systems, reducing startup current by up to 75%. This makes it a valuable solution for optimizing performance in areas with limited or unstable power sources.
- COMPATIBILITY WITH GENERATORS: Specially engineered to work with generators, inverters, and limited utility power, this soft start kit for home air conditioner reduces startup current by up to 75%, ensuring smooth AC operation even in off-grid or power-limited locations. This Easy Start flex home ac soft starter is compatible with 2-stage compressors and heat pump units, making it a versatile choice for diverse AC configurations.
- QUIET AND SMART PROTECTION: This soft starter for air conditioner reduces startup noise and prevents light flickering, creating a quieter, more comfortable environment. The intelligent fault detection and short-cycle delay timer of this ac softstart protect your compressor motor from low-voltage damage and excessive wear, extending the life of your aire acondicionado unit and delivering peace of mind.
- COMPACT DESIGN FOR EASY INSTALLATION: With a 50% smaller enclosure size, this ac soft start kit for home is built to fit into tight or confined spaces without compromising performance. This versatile ac unit soft start kit offers a simplified setup suitable for both DIY enthusiasts and professionals, making installation quick and straightforward.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0DKQN4XRJ |
| Additional Features | Portable |
| Air Conditioner Application | Residential, RV, Commercial |
| Best Sellers Rank | #4,284 in Automotive ( See Top 100 in Automotive ) #8 in RV Heating, Ventilation & Air Conditioning |
| Brand Name | MICRO-AIR |
| Capacity | 6 Tons |
| Compressor Type | rotary_scroll |
| Control Method | App |
| Controller Type | App Control |
| Customer Reviews | 4.7 4.7 out of 5 stars (518) |
| Efficiency | 15 |
| Form Factor | Portable |
| Installation Type | Split System |
| Inverter Type | No Inverter |
| Is Outdoor Unit Required | No |
| Item Dimensions D x W x H | 9"D x 4"W x 3"H |
| Manufacturer | MICRO-AIR |
| Model Name | MicroAir Flex 398 with Installation Kit |
| Model Number | 398 KIT |
| Power Source | Corded Electric |
| Seasonal Energy Efficiency Ratio (SEER) | 15 |
| UPC | 850049469227 |
| Unit Count | 1.0 Count |
| Voltage | 240.0 |
| Warranty Type | Lifetime |
| Wattage | 21102 watts |

## Product Details

- **Brand:** MICRO-AIR
- **Capacity:** 6 Tons
- **Form Factor:** Portable
- **Model Name:** MicroAir Flex 398 with Installation Kit
- **Power Source:** Corded Electric
- **Product Dimensions:** 9"D x 4"W x 3"H
- **Seasonal Energy Efficiency Ratio (SEER):** 15
- **Special Feature:** Portable
- **Voltage:** 240.0
- **Warranty Type:** Lifetime

## Images

![MICRO-AIR EasyStart FLEX 398 - Bluetooth Soft Start Kit for Home Air Conditioner, RV & Commercial Use, Works with Generators, Reduces Power Surge, Efficient Start-Up - Up to 6 Tons w/Installation Kit - Image 1](https://m.media-amazon.com/images/I/81zVC9t-8wL.jpg)
![MICRO-AIR EasyStart FLEX 398 - Bluetooth Soft Start Kit for Home Air Conditioner, RV & Commercial Use, Works with Generators, Reduces Power Surge, Efficient Start-Up - Up to 6 Tons w/Installation Kit - Image 2](https://m.media-amazon.com/images/I/81GPHkNP7gL.jpg)
![MICRO-AIR EasyStart FLEX 398 - Bluetooth Soft Start Kit for Home Air Conditioner, RV & Commercial Use, Works with Generators, Reduces Power Surge, Efficient Start-Up - Up to 6 Tons w/Installation Kit - Image 3](https://m.media-amazon.com/images/I/81li6X0W9uL.jpg)
![MICRO-AIR EasyStart FLEX 398 - Bluetooth Soft Start Kit for Home Air Conditioner, RV & Commercial Use, Works with Generators, Reduces Power Surge, Efficient Start-Up - Up to 6 Tons w/Installation Kit - Image 4](https://m.media-amazon.com/images/I/81ZX-W9qHQL.jpg)
![MICRO-AIR EasyStart FLEX 398 - Bluetooth Soft Start Kit for Home Air Conditioner, RV & Commercial Use, Works with Generators, Reduces Power Surge, Efficient Start-Up - Up to 6 Tons w/Installation Kit - Image 5](https://m.media-amazon.com/images/I/81g6ThQ7NsL.jpg)

## Available Options

This product comes in different **Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Performs as Advertised! Good Value! Easy Install. Real World Performance!
*by M***E on July 15, 2025*

EDIT: I installed this item one week ago today. It has worked as advertised. While returning from running errands this morning I received a notification on my phone that the power was out at the house. The first real world opportunity to see if this piece of kit is worthy of the cheddar. I arrived home in about 10 minutes and confirmed much of the neighborhood was out. It's hot, DAMNED HOT, outside today and this will never do! It took about 15 minutes total time to get the gennie up and running and arrive at the moment of truth. I flipped the breaker for the gennie and powered the panel, then energized the furnace circuit (Ecobee thermostat controls), then energized the A/C circuit and waited. It took right at 2 minutes for the Ecobee to come online (wifi is on UPS) and call for cool. The fan on the A/C started first, seconds later the compressor started, the gennie shouldered the load like a CHAMP, and the A/C was running! I energized the rest of the circuits according to my emergency power plan and monitored cycle performance in cool air conditioned comfort. "I love it when a plan comes together!", Colonel John "Hannibal" Smith. Purchase with confidence! OE Review... Meets and exceeds expectations. Simple, straightforward four wire installation. Easy enough for a handy DIYer. They even have a short YouTube instruction video! I purchased this so I could have AC when the power goes out. I have a 4 ton HVAC that drew 106a inrush before installation. Too much for a modest portable generator in a power outage. After 6 learning cycles it only pulls 26.xxa! A bona fide 75% reduction in startup draw! It’s also much quieter now too. I highly recommend!

### ⭐⭐⭐⭐⭐ Great product. Exactly what I needed to run my house from my generator.
*by T***Y on March 31, 2026*

I purchased this to reduce the starting load from my AC unit so I can run my house on my backup generator. I'm a very technical/handy person and found the installation instructions very easy to understand. I don't think you need to be very technical/handy to install this device. The installation was quick. The product works GREAT. Prior to install, my AC would not start on generator power. Now it all starts and I'm ready for the next storm. Great product!

### ⭐⭐⭐⭐⭐ Working as it should , In rush current reduced from 80AMPS to 32-33AMPS
*by J***I on September 1, 2025*

Update after 8 months .. device workin perfectly fine, total starts in the past 8 months is 4498 ( see attached picute ) I have a 3Ton , 35000BTU Goodman DSZC180361 heat pump with a Two-Stage Copeland UltraTech scroll compressor ( RLA 15.3Amp , LRA 83Amp, FLA 2.8Amp) , installed MICRO-AIR Easy Start FLEX 398 - Bluetooth Soft Start Kit few days ago , followed the instruction from the install guide " Easy Start Home AC Wiring Installing The Micro-Air Easy Start" section 5 , page 11-12, installation took less than 15 min. I have the Emerson comfort alert board " Late Model " . In rush current is reduced from around 80Amps to around 32-33 Amp during start up, after 5 "learned starts and 34 total starts with zero fault. (as of today) The easy start perfectly fit in the condenser housing, so its hidden from elements :) !!! BUT !!! I ran into some issues ... The soft start device killed the Heat Pump start capacitor after the first 2 successful learned starts. Heat Pump wasn't able to start , fan was working fine , of course no cold air , "open start circuit " error on the thermostat screen. First thought is the easy start what causing the issue , so i uninstalled the device , but still no working compressor, no cold air , same error on the thermostat ... same symptoms.. Replaced the start capacitor (Titan Pro 40+5 MFD 440 V), Heat pump up and running ... re installed the easy start device ... heat pump up and running ... In rush current is around 32-33 Amps. Not sure why or what happened , the manufacturing date on the start capacitor was 2014 , so it was to time to replace anyway :) Contacted Micro Air customer service via email 3 times before purchase , to make sure the device is compatible with my unit , never ever received any responds, so decided to give a try :). Contacted Micro Air customer service about the issue i faced after the first installation, i received answer on the same day. Contacted Micro Air customer service , after capacitor replacement , asked if i should re install the easy start device ( worried its going to kill the new capacitor i just installed), did not get any answer yet , so i went ahead and re installed the device ... so far everything working as its should now :) as of now , 5 star for the device 5 Star for the super easy instalation 5 star for the device functionality 5 start for the online instruction , installation manual 3 star for customer service Thats a 4.6 stars :) Going to update my review if " something " happening in the future :) Update : Micro Air Customr service contacted me , next day after i submitted my review , and suggested to re install the easy start device :)

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*Product available on Desertcart Hong Kong*
*Store origin: HK*
*Last updated: 2026-04-22*