Top-Rated Heating and Air Conditioning Services in Sarnia, ON

Postma Heating & Cooling keeps Sarnia homes comfortable year-round with same-day service, on-time arrivals, and straightforward pricing. Call now to book.

When you need Air Conditioning services or heating services in Sarnia, ON, count on Postma Heating & Cooling. As your local AC contractor and heating contractor, we provide thorough diagnostics, honest options, and expert repairs and replacements that restore comfort fast. Our background-checked technicians use the latest technology, follow safety- and cleanliness-focused practices, and back every visit with 100% guaranteed satisfaction. From urgent AC service to preventive heater service, our air conditioner service company and furnace service company is here to help.

See why your neighbours recommend us. Visit our Reviews page to learn how our on-time service, rapid response, and friendly pros make AC and heating easy in Sarnia.

Air Conditioning Repair and Replacement in Lambton County

A cooling outage during a heatwave can’t wait. As a trusted air conditioner service company in Lambton County, we offer same-day AC service whenever possible, thorough, educated troubleshooting before work, and flat-rate pricing with no surprises. Whether it’s a quick fix or a complete air conditioner replacement, your AC service is handled by skilled, professional, and personable technicians.

What we service and install:

  • Central air conditioners, heat pumps, and ductless mini-splits
  • High-efficiency air conditioner installation and system upgrades
  • Smart thermostat setup, airflow balancing, and zoning
  • Indoor air quality add-ons like media filters and UV lights

Signs you may need AC repair or replacement:

  • Warm air from vents, weak airflow, or uneven cooling
  • Short cycling, frequent breaker trips, or the system won’t start
  • Strange noises such as buzzing, grinding, or banging
  • Musty odours, ice on refrigerant lines, or water near the air handler
  • Energy bills spiking without a change in usage
  • AC is 10–15+ years old with recurring repairs

Why Sarnia homeowners choose Postma:
Our AC service company is a 9-time winner of the Best of CK award, known for rapid response and fast fixes, straightforward pricing, and proactive, clear communication and scheduling from first call to final cleanup.

Evaporator Coil Repair and Replacement in Lambton County

If your system freezes up, leaves water around the air handler, or struggles to cool, your evaporator coil may be the culprit. As an experienced AC service company, we diagnose the real cause—dirty fins, airflow restrictions, or refrigerant-related issues—and recommend the right solution, from deep cleaning and drain line clearing to coil repair or replacement.

Common signs your evaporator coil needs service:

  • Ice forming on the indoor coil or refrigerant lines
  • Water in the drain pan or around the air handler
  • Weak airflow and reduced cooling capacity
  • Frequent low-refrigerant codes or repeated top-ups

What to expect with Postma:

  • Latest technology for precise airflow testing and leak detection
  • Proper coil sizing, brazing, evacuation, and charging to manufacturer specs
  • Straightforward pricing and options explained clearly before work begins
  • Consistent aftercare and maintenance that protects your investment

Furnace Repair and Replacement in Lambton County

When the temperature drops, you need dependable heat. Postma Heating & Cooling is the furnace contractor Sarnia trusts for fast furnace repair, high-efficiency furnace replacement, and thorough maintenance. Expect on-time service windows, clear communication, and safety- and cleanliness-focused work from background-checked technicians.

Furnace services we offer:

  • Gas and electric furnace repair and tune-ups
  • High-efficiency furnace installation and system upgrades
  • Safety inspections, cleanings, and performance optimization
  • Thermostat calibration and airflow balancing

Signs you may need furnace repair or replacement:

  • No heat, weak airflow, or cold spots in rooms
  • Frequent cycling, hard starts, or short cycling
  • Unusual noises like banging, squealing, or rattling
  • Yellow burner flame or persistent burning odours
  • Energy bills rising while comfort declines
  • Furnace age 12–20 years with recurring repairs

Why choose Postma for heating:
We provide thorough, educated troubleshooting before work, flat-rate pricing tailored to your needs, and a membership program with real savings that includes priority service and reminders. Our heating service company stands behind every job with a 100% satisfaction guarantee.

Boiler Repair and Replacement in Lambton County

Hydronic heat is efficient and comfortable—when it’s maintained. Our heating service company repairs, replaces, and optimizes boilers, circulators, and controls, including high-efficiency condensing models. If your boiler is outdated or unreliable, we’ll size the right replacement, handle permitting, and complete professional commissioning for safe, quiet, and consistent heat.

Boiler services include:

  • Boiler repair and annual safety inspections
  • High-efficiency boiler replacement and retrofits
  • Zoning, controls, and pump optimization
  • System purges, air elimination, and water quality management

Indicators your boiler needs attention:

  • Cold radiators or uneven heating from room to room
  • Kettling noises, lockouts, or error codes
  • Visible leaks or corrosion on piping or the heat exchanger
  • Rising fuel usage and slow heat recovery

Get seasonal tips and expert insights. Visit our News & Media for maintenance checklists and energy-saving advice to keep your systems running smoothly in Sarnia.

Why Call Postma for AC Refrigerant Leaks and Radiator Heater Service in Sarnia, ON

Refrigerant Leak Detection and Repair:
Low refrigerant reduces cooling capacity, raises energy costs, and risks compressor failure. Our air conditioner service company pinpoints leaks using electronic sniffers, UV dye, and nitrogen pressure testing. We then repair, properly evacuate, and recharge to manufacturer specs, followed by post-repair performance testing. If your system qualifies, we offer manufacturer warranty advocacy that saves customers money by maximizing eligible benefits.

Radiator Heater Repair and Balancing:
If your radiators hiss, stay cool, or heat unevenly, we diagnose air traps, stuck valves, sludge buildup, and flow issues in older homes. As a heating contractor experienced with legacy systems, we provide problem-solving in challenging situations and reliable project management for complex installs and retrofits—so every room feels just right.

What you can expect:

  • Same-day services and on-time arrivals when you need us most
  • Skilled, professional, and personable technicians who respect your home
  • Safety- and cleanliness-focused work with full cleanup after the job
  • Straightforward pricing, clear options, and honest repair vs. replace guidance
  • Consistent aftercare and maintenance for fewer surprises year-round

Preventive Maintenance for Year-Round Comfort

Protect your investment with seasonal tune-ups for both AC and heating. Our membership program offers real savings, priority scheduling, and service reminders that help extend system life and maintain high efficiency—all backed by our 100% satisfaction guarantee.

Call Postma Heating & Cooling at 519-354-9491 for expert AC and heating service in Sarnia, ON. Schedule same-day repair or request a free replacement estimate now.