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Both help a compressor start — but they solve different problems. One adds torque for a struggling compressor; the other tames the electrical surge for limited-power setups.
Side by side
Hard start kit
Soft starter
What it does
Adds torque so the compressor starts faster
Reduces the inrush current at startup
Best for
A struggling or aging compressor, low voltage, long line sets
Running AC on a generator, solar, or RV power
Effect
Less strain and heat at start-up
Smaller electrical surge
Install
2-wire add-on, minutes
More involved wiring
Cost
Low
Higher
When you need a hard start kit
Lights flicker when the AC kicks on, the unit hums or hesitates before running, or it struggles on hot days. That’s a torque problem — a hard start kit fixes it.
Furnace Direct · Factory-Direct Pricing
Why pay a contractor's markup?
Buy the same name-brand AC system the pros install — shipped factory-direct to your door. No middleman, 5-star rated, and financing available.
If you’re running AC off a generator, solar, or limited RV power and need to cut the startup surge, that’s a soft starter’s job — a different fix for a different problem.
Our pick
For a typical home compressor that struggles to start, the genuine RectorSeal Kickstart T05 is the simple, proven fix — a 2-wire kit that gets the compressor up to speed fast.
Buy the genuine part. We ship authentic RectorSeal, factory-sealed, with the full manufacturer warranty — not the counterfeits that flood marketplaces. Nationwide shipping with tracking.
Which one do I need? A hard start kit boosts torque for a struggling residential compressor. A soft starter reduces the startup current surge for generator, solar, or RV power.
Will a hard start kit fit my AC? The RectorSeal Kickstart T05 fits single-phase 1–3 ton systems at 208–265V.
Does it ship nationwide? Yes — the genuine RectorSeal part ships nationwide with tracking.
★ Wholesale HVAC Direct
Get your system replaced.
Tell us a little about your home and what you're replacing. A specialist will call you to work out exactly what you need, go over the price, and get it replaced. No obligation.
★ 5.0 rating from real customers★ Fast freight shipping nationwide★ Factory-sealed with full warranty
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