No Heat in the House? What to Do With Your HVAC System

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No Heat in the House? What to Do With Your HVAC System

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Waking up to a cold house in the middle of winter is stressful—and sometimes alarming.

When your heat suddenly stops working, the problem may be simple, or it may require professional HVAC repair.

At Twintech Heating & Cooling, we help homeowners restore heat quickly and safely.

If you have no heat in your house, here’s what to do before—and when—to call an HVAC professional.

Step 1: Check Your Thermostat First

Before assuming the worst, start with the thermostat.

Make sure:

It’s set to HEAT, not COOL or OFF

The temperature is set higher than the current room temperature

Batteries are fresh (if applicable)

The display is on and responsive

If the thermostat isn’t sending a signal, your HVAC system won’t turn on.

Step 2: Check the Circuit Breaker and Power Supply

Your furnace or heat pump needs power to operate.

Look for:

Tripped breakers labeled “furnace,” “air handler,” or “HVAC”

A shut-off switch near the furnace that may have been turned off

A blown fuse if your system uses one

Reset a tripped breaker once.

If it trips again, stop and call a professional.

Step 3: Inspect the Air Filter

A clogged air filter can restrict airflow enough to shut down your heating system as a safety precaution.

If the filter looks dirty:

Replace it immediately

Restart the system

Wait a few minutes to see if heat returns

In winter, filters often need replacing every 30–60 days.

Step 4: Look for Furnace Error Codes

Many modern furnaces have a blinking light or digital display that shows error codes.

These codes can indicate:

Ignition failure

Flame sensor issues

Pressure switch problems

Airflow restrictions

If you see a code, note it—but don’t attempt repairs unless you’re trained to do so.

Step 5: Check the Pilot Light or Ignition (Gas Furnaces)

If you have a gas furnace:

Make sure the gas valve is on

Check whether the pilot light is out (older systems)

Listen for ignition attempts

If you smell gas, leave the home immediately and contact your gas provider or emergency services.

Step 6: Check Outdoor Units (Heat Pumps)

If you use a heat pump:

Make sure the outdoor unit isn’t buried in snow or ice

Clear debris and ensure airflow

Allow time for defrost cycles to complete

Heat pumps may blow cooler air during defrost—this is normal—but they should not stop heating altogether.

When Not to DIY

Stop troubleshooting and call a professional if:

The system repeatedly shuts down

You hear loud banging, screeching, or grinding

There’s a burning or gas smell

Breakers keep tripping

The system turns on but never produces heat

Continuing to reset or restart a failing system can cause further damage.

How Twintech Can Help Restore Heat Fast

At Twintech Heating & Cooling, we prioritize no-heat calls because we know how urgent they are.

Our technicians quickly diagnose the issue, explain your options clearly, and get your heat back on safely.

Whether it’s:

Furnace repair

Heat pump troubleshooting

Emergency heating service

System replacement

We’re here when your home needs heat the most.

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