AC Repair Near Waltham, MA

$99 Air Conditioning RepairDiagnostic

$89 Air Conditioning Repair Diagnostic

$79 Air Conditioning Repair Diagnostic

$99
Regular Price
$99
$89
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Regular Price
$99
$79
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Noticing strange sounds, weak airflow, or rising energy bills? See the full list of hidden HVAC warning signs before it’s too late ↓

AC Repair Near Waltham, MA

(508) 443-6451
(508) 443-6452
(508) 443-6453
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Waltham AC Repair with Honest, Fair Pricing

Our technicians are skilled and continually trained. They arrive with the right diagnostic tools and well-stocked vehicles. In most cases, we resolve your AC repair on the first visit.

We are transparent from the start. Your technician explains every option and price before any work begins. We service most equipment brands. Your comfort is backed by our satisfaction guarantee.

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SumZero Energy Systems is Here for All of Your AC Repair Needs in Waltham!

  • Fully Stocked Trucks — most repairs completed in a single visit
  • Friendly Professionals — courteous techs who respect your home and time
  • Fully Licensed & Insured — work you can trust, start to finish
  • Same Day Service Available — fast relief when you need it most
  • 100% Satisfaction Guarantee — we stand behind every repair
  • Complimentary 2nd Opinions — get clarity and confidence before you commit

We’re ready to help with AC repair in Waltham, MA. Our team proudly delivers professional, reliable service to our local community, ensuring your home or business stays comfortable all season long.

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Top-Quality Heating and Cooling Services Near Waltham, MA

Call Today for Your AC Repair!

Reliable, High-Quality AC Repair to Restore Your Comfort Fast

AC Repair and Waltham MA’s Trusted Heating & Cooling Professionals — Your Local Experts

When your cooling system falters, SumZero Energy Systems delivers AC Repair that finds the root cause fast and fixes it right the first time. Our certified technicians perform a complete diagnostic—thermostat calibration, electrical testing, refrigerant pressure checks, airflow measurements, and leak detection—to resolve common issues such as warm air, weak airflow, frequent cycling, frozen coils, refrigerant leaks, clogged filters, thermostat or sensor failures, drain clogs, and worn capacitors or blower motors. We explain your options clearly and complete precise repairs, including coil cleaning, drain clearing, wiring and component replacement, duct sealing, and refrigerant service as appropriate. Beyond AC Repair, we provide full-service HVAC solutions: preventative maintenance and tune-ups, new AC and heat pump installations, ductless mini-splits, furnace and boiler services, indoor air quality upgrades, smart thermostats, and emergency support. Expect exceptional service, transparent communication, and quality craftsmanship on every visit, backed by dependable parts and workmanship. SumZero Energy Systems proudly and professionally serves the Waltham, MA area.

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AC Repair in Waltham

Recognize the Signs and Risks

Noticing unusual noises, weak airflow, or rising energy bills? Review the key signs and risks that can affect comfort and safety in Waltham. Address issues early and count on SumZero Energy Systems for prompt, professional AC repair guidance and service.

Unresponsive thermostat

Sign

Electrical issues or dead batteries.

‍

Risk

Lack of temperature control can lead to system overuse and higher bills.

Estimated Time for Diagnostic:
20 minutes

Reduced cooling efficiency

Sign

Dirty coils, clogged filters, or failing components.

Risk

Higher energy bills and poor comfort levels.

Estimated Time for Diagnostic:
45 minutes

Water pooling around the unit

Sign

Clogged condensate drain or refrigerant line issues.

Risk

Water damage to your home and mold growth if not addressed.

Estimated Time for Diagnostic:
30 minutes

Unusual rattling or buzzing sounds

Sign

Loose parts or motor issues.

Risk

Continuous use can lead to severe damage and higher repair costs.

Estimated Time for Diagnostic:
30-45 minutes

A/C blowing warm air

Sign

Refrigerant leaks or a faulty compressor.

Risk

Ineffective cooling during hot weather, leading to discomfort and overworked systems.

Estimated Time for Diagnostic:
30–60 minutes

Schedule a Comprehensive Home AC Repair Near You in Waltham, MA

Is your home’s heating system acting up? Trust SumZero Energy Systems for reliable repair services near you. Schedule your appointment today and get expert help on the way!

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Frequently Asked Questions About AC Repair

Have questions about cooling issues? You’re not alone—SumZero Energy Systems is here with clear, trustworthy answers to help you make confident AC repair decisions.

Why choose SumZero for air conditioning repairs?
We're local, responsive, and focused on customer satisfaction. With transparent pricing and expert technicians, you're in good hands with SumZero.
Will I get a quote before you do the repair?
Absolutely. We explain the issue and provide a straightforward quote before any repair work starts—no pressure, no surprises.
How long does a typical A/C repair take?
Most A/C repairs take 30 to 90 minutes depending on the issue. We'll give you a clear estimate before we begin work.
Do you work with all A/C brands and models?
Yes, we repair all major air conditioning brands—whether it’s central A/C, mini-split, or packaged systems.
Is it better to repair or replace my A/C system?
If your system is under 10 years old and the repair is minor, fixing it makes sense. We’ll give honest advice based on your situation and long-term comfort.
What if my A/C is blowing warm air?
This could be due to low refrigerant, a faulty compressor, or airflow problems. Our techs will quickly identify the cause and get it fixed.
Can you repair my A/C unit on the first visit?
In many cases, yes. Our service vehicles are stocked with common parts, so we can often complete the repair right away.
How much does it cost to diagnose an A/C issue?
We offer a flat-rate $99 diagnostic visit, which includes a full system inspection and a clear explanation of any needed repairs.
Do you offer same-day A/C repair services?
Yes! We do our best to provide same-day appointments depending on availability and urgency, especially during hot weather.
What are the most common signs that my A/C needs repair?
Warm air, unusual noises, weak airflow, frequent cycling, or rising energy bills are clear signs your air conditioner might need attention.