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HVAC Problems

Heating, cooling, and ventilation issues that affect your comfort.

It's the middle of July, 98 degrees outside, and your AC just wheezed its last breath. The house is already 85 degrees and climbing. You're standing in front of the thermostat like it betrayed you personally.

Or maybe it's February, the furnace is making a sound like a dying washing machine, and you can see your breath in the living room.

Heating and cooling systems have a special talent for failing at the worst possible time. They run quietly in the background for years, and then one day—they don't. This section helps you diagnose what's gone wrong, what you can try before calling for help, and what red flags mean your system is on its last legs.

DIY Repairs

You can probably handle this yourself:

Changing air filters — Do this every 1–3 months. A clogged filter is the #1 cause of HVAC problems.
Clearing debris from the outdoor unit — Leaves, grass, and dirt block airflow. Hose it down gently and keep a 2-foot clearance around it.
Checking thermostat settings — Sometimes the problem is that someone switched it to "heat" in July or the batteries died.
Resetting the system — Turn it off at the thermostat and breaker, wait 5 minutes, turn it back on. This clears minor glitches.
Cleaning visible dust from vents — Vacuum out your floor registers. Clogged vents reduce efficiency.

When to Call a Pro

Call an HVAC technician:

Refrigerant leaks — Your AC isn't cooling, and there's ice on the lines. Low refrigerant means a leak. Only pros can legally handle refrigerants.
Strange sounds or smells — Banging, screeching, or burning smells indicate serious mechanical or electrical problems.
Short cycling — System turns on and off constantly. Could be a thermostat issue, or it could be a dying compressor.
No heat in winter — If your furnace won't ignite or the blower won't run, there are too many potential causes (and dangers) to troubleshoot yourself.
Carbon monoxide concerns — If your CO detector goes off or you suspect a cracked heat exchanger, get out and call a pro immediately.

What to Expect

Cost Ranges

Annual maintenance visit: $100–$200
Refrigerant recharge: $200–$600
Capacitor or contactor replacement: $150–$350
Compressor replacement: $1,500–$2,500
New AC unit (installed): $5,000–$12,000
New furnace (installed): $4,000–$8,000

Timeframes

Routine maintenance: 1–2 hours
Minor repairs: 1–3 hours
Major component replacement: Half day
Full system replacement: 1–2 days

Questions to Ask an HVAC Tech

"Can you show me exactly what's wrong?"
"Is this a repair that'll last, or am I patching a dying system?"
"What's the warranty on parts and labor?"
"Should I repair or replace? What's the break-even point?"
"What maintenance can I do myself to prevent this?"

Frequently Asked Questions

Why is my AC running but not cooling?

Could be a dirty filter, low refrigerant, a frozen coil, or a failing compressor. Start with the filter—it's the cheapest fix.

Should I worry if my AC is making a buzzing noise?

A faint hum is normal. A loud buzz can mean a failing capacitor or electrical issue. If it's new or loud, get it checked.

Why does my HVAC turn on and off so frequently?

"Short cycling" stresses your system. Causes include dirty filters, oversized units, low refrigerant, or thermostat issues.

How often should I change my air filter?

Every 1–3 months, depending on pets, allergies, and how hard your system runs. Set a phone reminder.

Why does my furnace smell like burning dust?

First time you turn it on each winter? That's just burning off dust. If it persists or smells like plastic or electrical burning, shut it off and call a pro.

Can I run my AC without a filter temporarily?

You can, but don't. Dirt will coat your coils, reduce efficiency, and eventually kill your compressor. A cheap filter is cheaper than a new AC.

Why are some rooms hotter or colder than others?

Usually ductwork issues—improperly balanced or leaky ducts. A pro can test and seal them. Closing vents actually makes this worse.