Soft Starters: The Smart Upgrade Every HVAC Pro Should Know

WeSupplyTrades Team11/05/2025

Most technicians have heard of hard start kits or start capacitors. These kits give a compressor a short burst of energy to get it moving. While hard start kits still have a place in the HVAC world, a soft starter can often be the better choice. It provides a smoother, quieter, and more reliable startup that helps extend the life of the equipment.

At WeSupplyTrades, we help professionals like you choose smarter solutions that make every install more efficient and dependable.

What is a Soft Starter?

A soft starter is an electronic device that gradually ramps up the voltage supplied to your compressor motor during startup. Instead of delivering full power all at once, it increases voltage in a controlled manner, which reduces inrush current and allows the motor to reach operating speed smoothly.

This small change makes a big difference:

Reduces inrush current by up to 70 percent
Prevents lights from dimming during startup
Lowers compressor noise at startup
Reduces wear and tear on wiring and components
Extends compressor lifespan

A soft starter is ideal for single-phase and standard three-phase HVAC compressors that demand precision and protection. It helps ensure that both new and retrofit units start gently every time.

Why Technicians and Installers Choose Soft Starters

Soft starters are designed to make installations more professional and reliable. When you add one to a system, you reduce strain on electrical components and improve long-term performance.

Key benefits include:

Generator-friendly operation: Starting an AC can overload a generator. Soft starters reduce that surge demand and make it easier for generators to handle the load.
Less customer disruption: No more flickering lights or loud compressor kick-ons.
Better protection: Built-in features often include low-voltage limits and current monitoring to safeguard the system.
Fewer callbacks: Stable startups mean fewer electrical complaints and less troubleshooting.

For technicians who value durability, performance, and customer satisfaction, soft starters offer peace of mind with every install.

Ideal Applications

Soft starters are a smart addition for:

Homes using backup generators or solar power
Single-phase compressor systems with high starting loads
Older electrical panels prone to nuisance breaker trips
Standard compressor replacements or upgrades where smooth starting is desired

They are especially valuable when consistent comfort and reliable power management matter most.