Humidifier
Whole-Home Humidifier
London Ontario
A whole-home humidifier installed on your forced-air furnace maintains 35 to 45 percent relative humidity throughout your London Ontario home all winter — automatically, through your existing ductwork, connected directly to the water supply. London Ontario winters drop indoor RH to 15 to 25 percent in January without supplemental humidification: dry skin and nasal passages, static electricity on every surface, wood floors and furniture cracking, and increased susceptibility to respiratory illness. Hawana installs Aprilaire bypass, fan-powered, and steam whole-home humidifiers across London Ontario and Southwestern Ontario. TSSA certified. BBB A+. 138 five-star reviews.
What Happens When Indoor Humidity Drops Below 30% in London Ontario
Cold outdoor air holds very little moisture. When it enters a heated home and warms up, its relative humidity plummets. A London Ontario home in January, without any humidification, typically runs 15 to 25% RH — well below the healthy and comfortable range of 35 to 45%.
Dry Skin, Lips, and Nasal Passages
Below 30% RH, skin loses moisture faster than it can be replenished. Lips crack. Nasal mucous membranes dry out — reducing their ability to trap airborne particles and increasing susceptibility to winter colds and respiratory infections. The most common and immediate effect of low indoor humidity.
Static Electricity on Every Surface
Static builds up when air is too dry. Door handles, wool blankets, pets, and car door handles all deliver static shocks. Below 25% RH, static electricity accumulates rapidly on fabrics, furniture, and electronics. A reliable indicator that indoor humidity is too low.
Cracking Hardwood Floors and Furniture
Wood expands and contracts with humidity. At 20% RH, hardwood floors develop gaps between boards and furniture joints loosen. Vintage items, musical instruments, and solid-wood furniture are particularly vulnerable. Once cracking occurs, it cannot be fully reversed. Prevention is far less expensive than repair.
Increased Respiratory Illness Risk
Viruses that cause colds and influenza survive longer and spread more efficiently in dry air. Dry nasal passages reduce the mucous membrane's effectiveness as a filter. A home consistently maintained at 40% RH provides a meaningful reduction in airborne virus transmission compared to a 20% RH environment.
Perceived Cold — Higher Heating Bills
Dry air feels colder at the same temperature because moisture improves the body's ability to retain heat. Homeowners in dry homes often raise the thermostat to feel warm. At 40% RH, the same thermal comfort is achievable at 1 to 2°C lower setpoint — reducing heating energy consumption 3 to 5%.
Increased Dust and Airborne Particles
In dry air, dust particles remain airborne longer because they are lighter and do not clump with moisture. Humidified air causes particles to become slightly heavier and settle faster. Homes with properly humidified air typically see less dust accumulation on furniture despite the same air quality baseline.
Whole-Home Humidifier vs Portable Humidifiers — London Ontario
✗ Portable Room Humidifiers
- Serves one room — rest of the home stays dry
- Output: 2–4 litres per day — not enough for a London Ontario home
- Requires manual filling once or twice daily in winter
- Must be cleaned every 2–3 days to prevent mould and bacteria growth in the tank
- Needs replacement every 1–3 years
- No humidistat on basic models — no automatic control
- White mineral dust on furniture from ultrasonic models
- Cord on the floor — trip hazard, unsightly
✓ Whole-Home Humidifier (Aprilaire)
- Whole-home coverage through existing ductwork — every room
- Output: 12–23 litres per day — adequate for a London Ontario home
- Connected to water supply — never needs manual refilling
- Cleaned annually — water panel replaced each fall (10 minutes)
- Lasts 15–25 years with annual maintenance
- Humidistat with outdoor temperature compensation — automatic control
- No white mineral dust — evaporative or steam technology
- Out of sight, installed on furnace — no floor footprint
The hidden cost of portable humidifiers: Three portable units running at $60–$80 each, replaced every 2 years, cleaned twice per week, filled daily = significant time and cost with incomplete coverage. A whole-home bypass humidifier installed for $550–$750 operates for 15+ years with a $40 water panel replacement each fall. The payback on a whole-home installation over portable units is typically under 3 years — plus the whole-home coverage and automatic operation that portables cannot provide.
Bypass, Fan-Powered, and Steam — Choosing the Right Humidifier
All three connect to your plumbing supply and are controlled by a humidistat. The differences are in how they add moisture and how much output they can deliver.
Bypass Humidifier — Aprilaire 600
- Mounted on supply or return plenum
- Uses furnace blower airflow to pass air through wetted water panel
- Only operates when furnace is running — adequate for most homes
- Output: up to 12 litres per day at maximum
- Annual water panel replacement — ~$40 panel, 10 min DIY
- Lowest cost — best value for homes under 2,500 sq ft
- Requires a bypass duct between supply and return plenum
- Humidistat with outdoor temperature sensor included
Fan-Powered Humidifier — Aprilaire 700
- Own 24V fan motor — runs independently of furnace blower
- Works even when furnace is not in active heating mode
- Output: up to 23 litres per day — nearly double the bypass
- Better for homes with heat pumps (lower-stage operation)
- Slightly higher installation cost due to motor
- Annual water panel replacement — same as bypass
- No bypass duct required — more flexible installation
- Recommended for homes 2,500+ sq ft or with humidity-sensitive contents
Steam Humidifier — Aprilaire 800
- Boils water and injects steam into supply air
- Works with any heating system — heat pump, boiler, electric
- Highest output — up to 34 litres per day
- Most precise humidity control — responds quickly to setpoint changes
- Canister cleaning required every 1–2 months (mineral scale buildup)
- Higher operating cost — uses electricity to boil water
- Best for very large homes or non-forced-air systems
- Also suitable for homes with very hard water where evaporative panels clog quickly
How to Set Your Humidistat for London Ontario Winters
As outdoor temperature drops, the maximum indoor humidity that windows can handle without condensation decreases. A humidistat with outdoor temperature compensation adjusts automatically — or use this guide for manual adjustment.
| Outdoor Temperature | Max Indoor RH (double-glazed windows) | Recommended Setpoint | Risk |
|---|---|---|---|
| Above 0°C (October, April) | 50% | 45% — comfortable, no risk | None |
| -5 to 0°C (November, March) | 45% | 40% | None |
| -10 to -5°C (December) | 35–40% | 35% | Low |
| -15 to -10°C (January typical) | 30–35% | 30% | Watch windows |
| -20 to -15°C (London design temp) | 25–30% | 25–28% | Watch windows carefully |
| Below -20°C (extreme cold events) | <25% | Reduce to 20–25% | Condensation risk on single-glazed areas |
Aprilaire humidistats with outdoor temperature compensation: The Aprilaire 700 and 800 models include a digital humidistat with an outdoor temperature sensor that automatically adjusts the indoor humidity setpoint based on current outdoor conditions — preventing condensation on the coldest days without manual adjustment. Joss B.'s review below specifically mentions this feature as the detail they hadn't known about before the Hawana estimate visit.
Humidifier Maintenance Schedule — London Ontario
A bypass or fan-powered humidifier requires one annual maintenance action. A steam humidifier requires monthly attention during the season.
Water Panel Replacement
Bypass and fan-powered models only. Remove the old evaporator pad (which has collected mineral deposits from the water supply all season), install a new one. Aprilaire panels are ~$40 and take under 10 minutes to replace. Haze K.'s review specifically mentions this is a straightforward DIY task.
Water Distribution Tray Cleaning
Clean mineral scale and biofilm from the water distribution tray and drain tube. Use white vinegar or a mild scale remover. Takes 15–20 minutes. Part of the annual panel replacement visit. Hawana includes this in the annual HVAC maintenance plan.
Bypass Damper — Seasonal Switch
On bypass humidifier models: close the bypass damper at the end of the heating season (April/May) to prevent unconditioned outdoor air from bypassing the heat exchanger in summer. Open it at the start of the heating season (September). A common oversight that reduces summer cooling efficiency.
Steam Canister Cleaning
Mineral scale builds up in the boiling canister on steam humidifiers as water is boiled off repeatedly. The canister must be cleaned with a scale remover or replaced when scaling becomes excessive. London Ontario's moderately hard water means monthly checks are advisable during peak heating season.
Hawana Annual Maintenance Plan
Hawana's annual HVAC maintenance plan includes water panel inspection and humidifier tray cleaning as part of the fall furnace tune-up visit. Premium $249/yr includes priority dispatch. No monthly subscription. Maintenance plans ›
Humidifier and HRV — Complementary Systems
💨 HRV + Whole-Home Humidifier — The Most Common London Ontario Setup
An HRV (Heat Recovery Ventilator) continuously exhausts stale indoor air and draws in fresh outdoor air. In a London Ontario winter, that incoming outdoor air is very dry — even after being pre-warmed by the HRV, the fresh air has low absolute moisture content. The HRV improves air quality and recovers heat, but it also reduces indoor humidity by introducing dry outdoor air and exhausting more humid indoor air.
A whole-home humidifier compensates for the HRV's moisture-exhausting effect by adding water vapour directly to the supply air, maintaining the 35 to 45% RH setpoint despite continuous fresh-air ventilation. The two systems are controlled independently: the HRV runs on a ventilation timer for air quality, and the humidifier runs on the humidistat for moisture control. Together, they provide both fresh air and comfortable humidity without compromise.
An ERV reduces (but does not eliminate) the need for a supplemental humidifier because it retains some indoor moisture in the exhaust-to-intake transfer. For homes with an ERV that still run below 35% RH, adding a bypass humidifier is appropriate.
Your Whole-Home Humidifier Specialist — London Ontario
Abdullah Ghzail — Lead HVAC Technician & Founder
Abdullah installs Aprilaire whole-home humidifiers across London Ontario and Southwestern Ontario since 2018 — bypass or fan-powered recommended honestly based on home size because the 700 is not necessary for a 1,600 square foot home and no homeowner should pay for output they do not need; outdoor temperature compensation humidistat included because a humidistat without outdoor temperature sensing sets the same indoor humidity whether it is -5°C or -25°C outside, which causes condensation on the coldest days; and humidifier installation offered at every new furnace installation because waiting until January to realise the home is at 20% RH is entirely preventable. TSSA certified. BBB A+. 138 five-star reviews.
Humidifier Reviews — London Ontario
138 five-star reviews — Aprilaire 600 with new furnace (January 38–42% vs prior 18–22%), fan-powered 700 for acoustic guitar collection after failure crisis, bypass vs fan-powered honest advice (600 recommended for 1,600 sq ft Masonville home). Read all ↗
"Had Hawana install an Aprilaire 600 bypass humidifier with our new Goodman furnace. The technician connected it to the cold water line and wired the humidistat to the control board — about 45 minutes as part of the furnace installation. First winter: indoor humidity in January was 38–42%. Our previous winters without one: 18–22% — dry throats, static on everything, our daughter's skin was terrible. Night and day difference. The water panel replacement is a 10-minute DIY job each fall."
"Called Hawana mid-January after our 18-year-old furnace humidifier failed and indoor humidity dropped to 15%. I have acoustic guitars and the dry air was already affecting the wood — I could hear the finish starting to craze. Hawana installed an Aprilaire 700 fan-powered the next day. The technician explained the difference: the 700 runs its own fan and maintains humidity even when the furnace isn't in full heating mode — better for our 2,800 sq ft home and the collection. Humidity back to 40% within 24 hours."
"Asked Hawana to explain bypass vs fan-powered vs steam before deciding. The technician took 15 minutes to walk through all three with honest pros and cons — not pushing the most expensive. For our 1,600 sq ft Masonville home with a new Carrier and HRV already installed, he recommended the Aprilaire 600 bypass as sufficient. His reasoning: the 600 is adequate for our square footage, and with the HRV providing ventilation the bypass operation timing is less of an issue. Installed same day. The outdoor temperature compensation humidistat automatically reduces the indoor setpoint when it gets very cold outside — prevents window condensation. A feature I didn't know about."
Whole-Home Humidifier Installation — Southwestern Ontario
Whole-Home Humidifier FAQ — London Ontario 2026
How whole-home humidifiers work, types, cost, maintenance, humidity setpoints, condensation, heat pump compatibility, HRV pairing, heating cost savings, and brands.
Whole-Home Humidifier Installation in London Ontario?
Aprilaire bypass from $550 — fan-powered from $750 — steam from $1,200. Maintains 35–45% RH all winter through your existing ductwork. Humidistat with outdoor temperature compensation included. Works with furnace, heat pump, HRV, and ERV. TSSA certified. BBB A+. 138 five-star reviews.
More Air Quality & HVAC Services
💨 HRV — Heat Recovery Ventilator
Fresh air ventilation. Works with humidifier — complementary systems.
💨 ERV — Energy Recovery Ventilator
Retains some moisture. Reduces (not eliminates) humidifier need.
🔌 Air Filtration Services
HEPA, UV, media filtration for London Ontario homes.
🔥 Furnace Services
Humidifier offered at every furnace installation. Repair + install.
📋 Maintenance Plans — $149/yr
Annual humidifier inspection included with furnace tune-up.
♨️ Heat Pumps — HRS $7,500
Fan-powered humidifier recommended for ducted heat pump systems.
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