Hard Start Kit for an Over-Amping AC Compressor in Aubrey

An Older AC System in Aubrey Showing Signs of Strain

We recently stopped by a home in Aubrey for a fall maintenance visit as part of the homeowner's membership plan. The HVAC system was installed back in 2013, so it's now past the 11-year mark. That's a point where we start watching the big components a little more closely.

This wasn't the first time we'd seen this system. On an earlier maintenance visit, our technician measured the outdoor compressor and found it over-amping, meaning it was pulling more electrical current than it should. That's not something that stops your air conditioning cold on day one, but it's a clear warning sign that the compressor is under strain.

The homeowner had time to think it over and decided to go ahead with the fix we'd recommended: a hard start kit.

What We Did on This Visit

Since this was a fall visit, the focus was on getting the system ready for heating season. Our technician checked all the electrical, mechanical and performance parts of the system. The heating side looked good, and we didn't have any concerns there.

Then we took care of the compressor. We installed a hard start kit sized for this system, which included mounting it in the outdoor unit, wiring it into the compressor's starting circuit and testing the system afterward.

We also offered duct cleaning and blower cleaning. The homeowner chose to hold off on those for now, which is completely fine. We'll keep an eye on things at future visits.

• Full electrical, mechanical and performance check of the system
• Heating components inspected with no concerns found
• Hard start kit installed on the outdoor compressor
• Wiring, mounting and system testing completed

What It Means When a Compressor Draws Too Many Amps

Every compressor has a rated amperage printed on its nameplate. During a maintenance visit, a technician measures what the compressor is actually drawing and compares the two. When the reading runs high, the compressor is working harder than it was designed to.

The hardest moment in a compressor's life is startup. It has to go from a dead stop to full speed while pushing against refrigerant pressure. An aging motor can struggle with that, and the longer it takes to get going, the more heat and electrical stress build up inside it.

Over-amping can come from several places, and a good technician will look at all of them:

• Worn motor windings or bearings inside an aging compressor
• A weak or failing run capacitor
• A dirty outdoor coil that makes the system run at higher pressure
• Refrigerant charge that's off from where it should be
• Low or unstable voltage coming into the unit
• Worn contacts in the contactor that feed the compressor

In North Texas, summer heat makes all of this worse. When it's 100 degrees out, the outdoor unit is already fighting high pressures, and a compressor that's straining at startup gets hit hard dozens of times a day.

How a Hard Start Kit Helps, and What It Can't Do

A hard start kit is a small add-on, usually a start capacitor paired with a relay. When the compressor kicks on, the kit gives it a short, strong jolt of extra starting power. Once the compressor is up to speed, the relay takes the start capacitor out of the circuit so it isn't running all the time.

The result is a quicker, smoother startup. Less time stuck struggling means less heat in the motor windings and less stress on the electrical parts. On an older system, that can help stretch out the life of the compressor, which is the most expensive single part of your air conditioning.

It's important to be honest about what a hard start kit is. It's a helper, not a cure.

• It can reduce startup strain on an aging compressor
• It can help with lights dimming when the AC turns on
• It won't fix a compressor that's already failing internally
• It won't correct a refrigerant problem, dirty coil or bad wiring on its own

That's why we check the whole system first. If something else is causing the high amp draw, that needs to be addressed too. If you're noticing startup trouble, our AC repair team can track down the real cause.

Warning Signs You Can Watch For at Home

Most homeowners won't ever see an amp reading, but a struggling compressor often gives clues you can see and hear. None of these mean your system is about to quit, but they're worth mentioning to a technician.

• Lights flicker or dim for a second when the AC kicks on
• The outdoor unit hums, clicks or buzzes before it starts, or tries to start more than once
• The breaker for the AC trips
• The system shuts off soon after starting and then tries again
• The outdoor unit sounds louder or rougher at startup than it used to

There are a few safe things you can do yourself. Keep two feet of clear space around the outdoor unit, hose off grass clippings and cottonwood fluff from the outside of the coil, and change your air filter on schedule. If the breaker trips, you can reset it once. If it trips again, leave it off and call for service.

Please don't open the outdoor unit's electrical panel. Capacitors can hold a dangerous charge even with the power off.

Repair or Replace on a System From 2013?

A system that's 11-plus years old isn't automatically due for replacement. Plenty of well-maintained systems in North Texas keep running past that point. But age does change the math, and a high amp draw is a good reason to start planning.

A hard start kit is a sensible step when the rest of the system is in decent shape and you'd like to get more years out of it. If the compressor keeps getting worse, or other big repairs start stacking up, it may make more sense to look at AC replacement on your own schedule instead of in the middle of a July breakdown.

A few things affect what makes sense for your home:

• The overall condition of the compressor, coils and electrical parts
• Whether more than one major component is showing wear
• How often the system needs repairs
• Energy efficiency compared to newer equipment
• Whether the indoor and outdoor units are still a good match

The cost of a hard start kit installation depends on the system's size and the parts needed. Membership discounts on repairs can help, too. Our Captain's Club includes two HVAC maintenance visits a year, which is how this problem was caught early.

When to Call a Professional

If your lights dim when the AC starts, the outdoor unit sounds like it's struggling or the breaker keeps tripping, have it looked at sooner rather than later. A compressor under strain rarely fixes itself, and catching it early gives you more options.

Regular AC maintenance is the best way to spot high amp draw before it turns into a failed compressor. If you're in Aubrey, Pilot Point, Denton, Frisco, Prosper or nearby, give Sailor's Air & Plumbing a call at (940) 290-3800 and we'll take a look.