No heat in the house in Herndon, VA

No heat in the house in Herndon, VA can come from any part of the system — furnace, heat pump, or something as simple as the thermostat — and the first step is figuring out which kind of system you actually have.

The 5-minute check before you call

• Thermostat set to "Heat" and a temperature above the current room temp, with working batteries or power
• Breaker for the furnace or air handler hasn't tripped
• For gas furnaces — the gas valve at the unit is open and the pilot light (on older units) is lit
• Filter isn't so clogged it's choking off airflow
• For heat pumps — see our heat pump not heating page, since heat pumps have a few quirks (like normal cool-feeling air) that don't apply to furnaces

If it's specifically the furnace not responding at all, ourfurnace won't turn on page covers that case in more depth. This page is for when you're not yet sure which system or part is at fault.

When it's worth calling right away

No heat during freezing temperatures, or a home with an infant, elderly resident, or anyone with a heat-sensitive medical condition, is worth treating as urgent regardless of time of day. A no-heat situation in mild weather with no vulnerable residents can usually wait for a same-day or next-day appointment.

Herndon HVAC contractors who handle no-heat calls

How this works

Tell us what's happening and we connect you with an independent, licensed HVAC contractor serving Herndon. You contact them directly — we don't sell your information or auction you to multiple contractors at once.