HVAC indoor humidity during atmospheric river in Greater Vancouver

When an atmospheric river parks over the Lower Mainland and dumps rain for days, the air outside is saturated and indoor humidity tends to climb right along with it. Controlling that moisture keeps your home comfortable and protects it from the damp problems our wet stretches can cause.

Why humidity spikes during heavy rain events

During an atmospheric river, outdoor air holds enormous amounts of moisture, and any of it that gets indoors through ventilation, doors, or damp surfaces pushes humidity up. Combined with closed windows and everyday indoor moisture from cooking and showering, homes can feel clammy and sticky even when it is cool.

Indoor humidity control relies on ventilation that swaps humid indoor air for drier air and on keeping moisture sources in check. This is a passive ventilation and moisture issue, not something tied to combustion or refrigerant.

• Saturated outdoor air carrying moisture into the home
• Everyday indoor moisture from cooking, bathing, and laundry
• Closed-up rooms with little air exchange during long rain events
• Damp entryways and basements that add moisture to the air

Steps to keep indoor air comfortable

Keep air moving and remove moisture at the source. Run bathroom and kitchen exhaust fans during and after moisture-producing activities. If you have a ventilation system such as an HRV, make sure it is running and its filters are clean so it can exhaust humid air. A portable dehumidifier in a damp basement or suite can take the edge off during the worst days.

Avoid drying laundry indoors, wipe down wet surfaces, and keep entry mats dry. These small habits add up to noticeably drier, more comfortable indoor air during a multi-day rain event.

When to bring in a professional

If your home stays damp and stuffy despite ventilating, or you see condensation and musty odours building up during every rain event, your ventilation may not be keeping pace. HeatLand can assess your home's humidity and ventilation and recommend a balanced, effective solution so these heavy rain stretches no longer leave the air feeling heavy.

Frequently Asked Questions

Why is my home so humid during an atmospheric river?

The outdoor air is saturated, and with windows closed, that moisture plus everyday indoor sources builds up. Steady ventilation and exhaust fans help exchange it for drier air.

Should I open windows to reduce humidity during heavy rain?

Usually not, since the outdoor air is very humid then. Mechanical ventilation, exhaust fans, and a dehumidifier are more effective than opening up to saturated air.

Will a dehumidifier help during a rain event?

Yes, especially in a basement or suite that traps moisture. It removes excess humidity and makes the space feel more comfortable through the wettest days.

How do I know if my ventilation can't keep up?

Persistent condensation, musty smells, and a clammy feel during every rain event suggest your ventilation needs cleaning, adjusting, or upgrading. A professional assessment can confirm.

HeatLand Heating & Cooling is a licensed and insured, TSBC-certified HVAC company serving homeowners across Greater Vancouver. Our technicians diagnose the real fault, explain your options in plain language, and complete the work safely and to code.

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