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Too humid, too dry or stuffy air.

A trained tech should do this work, and a licensed tech should step in if water reached electrical parts.

Customers put it like this

  • It feels damp and musty
  • The house is so dry in winter
  • It's stuffy in here
  • The windows are wet on the inside
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Stop first if

  • Exhaust fans may be pulling fumes back, or a CO alarm soundsGet everyone into fresh air. Call emergency services or the gas utility from outside.
  • Humidifier water is reaching the furnace or electrical partsShut the water off only if it can be done without risk. Keep clear of wiring and call a licensed tech.
01

Ask on the call

6

Homeowner? These are the questions a good technician will ask you. Having the answers ready makes the first visit count.

  1. Is it summer or winter, and how long has it gone on?
  2. Do you have a humidifier, dehumidifier or ventilator?
  3. What does your indoor humidity reading say, and where was it taken?
  4. How often do the exhaust fans and dryer run?
  5. Do you see window condensation or mold?
  6. Do you rely on an air cleaner for fresh air?
02

Bring

5
  • Temperature and humidity meter
  • Aspirated psychrometer
  • Carbon dioxide meter
  • Digital manometer
  • Flashlight
03

Check on site

6
  1. Read indoor and outdoor temperature and humidity at the same time. Convert both to moisture content.
  2. If moisture content matches, look at the temperature effect before hunting a source.
  3. Identify the ventilation type and any fuel-burning appliances it affects.
  4. After steady occupancy, read carbon dioxide indoors and outdoors. Record the difference.
  5. Survey thermostat and humidistat locations.
  6. Inspect the humidifier, its drain and furnace surfaces below it.
04

Keep on the record

5
  • Paired indoor and outdoor readings
  • Ventilation type
  • Carbon dioxide readings
  • Sensor location photos
  • Humidifier condition

General guidance for a qualified person, not a finding about any home. The person on site decides.