WHOLE-HOME DEHUMIDIFICATION • HUMIDITY CONTROL • TORONTO & THE GTA
Whole-home dehumidification designed around the moisture problem.
Persistent high humidity is more than a thermostat setting. Moisture can come from outdoor air, infiltration, occupancy, basements, ventilation, cooling-system operation, water intrusion and the building itself. DAVESDUCTS evaluates the concern first, then determines whether whole-home dehumidification — or another correction — makes sense.
START WITH THE SOURCE
Why is the home too humid?
A dehumidifier removes moisture from the air, but it should not be used to hide an unresolved water or building problem. Before selecting equipment, DAVESDUCTS considers where the moisture may be coming from and how the HVAC system is operating.
Outdoor Humidity
Warm, humid outdoor air entering through ventilation, open doors, air leakage or other pathways can increase the indoor latent load.
Basements
Below-grade spaces can experience different temperature and moisture conditions than the upper floors and may remain humid even when the rest of the home feels comfortable.
Occupancy
Bathing, cooking, laundry and normal occupant activity continuously add moisture indoors.
HVAC Operation
Cooling-system sizing, runtime, airflow and operating strategy can influence how much moisture the air conditioner removes.
Ventilation
Outdoor-air ventilation can either help or add moisture depending on season, outdoor conditions and the ventilation strategy.
Water / Building Problems
Leaks, seepage, wet materials or other moisture intrusion should be corrected at the source rather than treated only with mechanical dehumidification.
WHEN DEHUMIDIFICATION MAY HELP
Signs that moisture control deserves a closer look.
Persistent High RH
Measured indoor relative humidity remains elevated for extended periods rather than only during a short weather event.
Cool, Damp Basement
The basement feels clammy or remains humid even when the main living area is comfortable.
Musty Odours
Persistent musty conditions can be a reason to investigate moisture sources, ventilation and humidity control.
Condensation
Recurring moisture on cool surfaces can indicate that indoor humidity, surface temperatures or both need investigation.
AC Doesn’t Control Humidity
The home reaches its cooling setpoint but indoor humidity remains higher than desired.
Shoulder Seasons
Humidity can remain high during mild weather when there is not enough sensible cooling demand to run the air conditioner for long periods.
IMPORTANT
High humidity is a symptom. Find the cause before sizing the solution.
If there is active water intrusion, a plumbing leak, drainage problem or wet building material, that source should be corrected. A dehumidifier can manage an appropriate latent load; it should not become a substitute for repairing the building.
WHOLE-HOME VS. PORTABLE
Where does the moisture problem exist?
CENTRAL
Whole-home dehumidification
A ducted dehumidifier can be integrated with an appropriate HVAC or dedicated duct system to manage humidity across a larger area of the home.
This can be useful where humidity is a recurring building-wide concern or where the cooling system alone does not provide the desired moisture control.
LOCALIZED
Portable dehumidification
If the concern is limited to one basement room or another small area, a properly sized portable dehumidifier may be the simpler solution.
A central system is not automatically justified when the moisture load is localized.
WHOLE-HOME SYSTEMS
How does a ducted dehumidifier work?
A whole-home dehumidifier draws humid air through the appliance, cools it below its dew point so moisture condenses, drains that water away, and then returns drier air to the building. The exact duct configuration depends on the equipment and application.
01
Sense Humidity
A dehumidistat or compatible control determines when additional moisture removal is required.
02
Process the Air
Humid air passes through the dehumidifier’s refrigeration process.
03
Drain Condensate
Water removed from the air is directed to an appropriate condensate drain or pumping arrangement.
04
Return Drier Air
Processed air is discharged back to the home through the designed duct configuration.
APRILAIRE WHOLE-HOME DEHUMIDIFIERS
Equipment should be selected by moisture load and application.
DAVESDUCTS offers AprilAire whole-home dehumidification solutions. Rather than publishing one model as the answer for every house, we recommend confirming the current equipment lineup and sizing the system around the actual building and installation.
Capacity
Dehumidifier capacity should reflect the moisture load, conditioned area and operating conditions rather than floor area alone.
Duct Configuration
Return and discharge connections need to be designed around the selected unit, HVAC system and manufacturer’s permitted installation arrangements.
Serviceability
Filters, drains and equipment components need practical access for future maintenance and service.
CURRENT EQUIPMENT
We confirm the model before we quote it.
Manufacturer lineups, capacities and specifications change. DAVESDUCTS will confirm the current AprilAire equipment, installation requirements and appropriate capacity for the project rather than relying on an outdated model list.
SIZING
Don’t size a dehumidifier by square footage alone.
Two houses with the same floor area can have very different moisture loads. Building leakage, basement conditions, ventilation, occupancy, cooling operation and outdoor-air exposure all affect how much water may need to be removed.
Moisture Load
Consider how much moisture is entering or being generated in the building and when the problem occurs.
Building Conditions
Basement construction, air leakage, insulation, windows and other envelope conditions can affect indoor humidity.
HVAC Interaction
The dehumidifier needs to operate appropriately with the existing furnace, air handler, heat pump or air-conditioning system.
AIR CONDITIONING VS. DEHUMIDIFICATION
Your air conditioner removes moisture — but humidity and temperature are not the same load.
Air conditioners remove moisture while cooling, but their primary control is typically based on temperature. A home can therefore reach the desired temperature before enough runtime has occurred to achieve the desired humidity.
Sensible Load
The cooling required to reduce indoor air temperature.
Latent Load
The moisture-removal requirement needed to reduce indoor humidity.
WHY THIS MATTERS
A cold house can still be humid.
Lowering the thermostat is not always an efficient or comfortable humidity-control strategy. Where a meaningful latent load remains after the cooling requirement is satisfied, dedicated dehumidification may be worth evaluating.
HEAT PUMPS & VARIABLE-CAPACITY HVAC
Humidity control should be coordinated with the equipment already installed.
Modern heat pumps and variable-capacity systems can operate differently from older single-stage air conditioners. Airflow, staging, runtime and controls can all influence moisture removal, so the complete system should be reviewed before adding another appliance.
Airflow
Cooling airflow influences coil temperature and latent performance and should remain within the equipment manufacturer’s approved operating requirements.
Runtime & Capacity
Variable-capacity equipment may run for longer periods at lower output, which changes the operating profile compared with conventional on/off equipment.
Controls
Where compatible, HVAC and dehumidification controls can be coordinated rather than allowing separate systems to work against each other.
VENTILATION & HUMIDITY
Outdoor-air ventilation changes the moisture balance.
An HRV or ERV intentionally exchanges indoor and outdoor air. Whether that helps or adds to an indoor humidity load depends on the season and conditions, which is why ventilation and dehumidification should be considered together.
HRV
Heat recovery without intentional moisture transfer.
During warm, humid weather, incoming ventilation air can add moisture that the cooling or dehumidification system must manage.
ERV
Heat plus partial moisture transfer.
An ERV transfers a portion of moisture between outgoing and incoming airstreams, which can reduce—but does not eliminate—the incoming moisture load under suitable conditions.
BEFORE INSTALLATION
What needs to be considered?
Equipment Location
Confirm sufficient space, service clearance and a suitable environment for the dehumidifier.
Ductwork
Determine the appropriate intake and discharge arrangement and any required sheet-metal transitions or dedicated ducts.
Drainage
Provide a suitable condensate route or pumping arrangement for the water removed from the air.
Electrical
Confirm the electrical requirements of the selected equipment and installation.
Controls
Determine how humidity will be sensed and how the dehumidifier will interact with applicable HVAC equipment.
Source Conditions
Identify obvious water intrusion, drainage or building concerns that should be corrected independently of the dehumidifier.
BASEMENTS
A cool basement can need dehumidification even when upstairs doesn’t.
Basements frequently have a different moisture profile than the rest of the home. Cooler surfaces increase relative humidity, and below-grade conditions can add moisture loads that are not reflected by a thermostat upstairs.
Localized Problem?
If only a small basement area is affected, a portable unit may be enough.
Whole-Basement Problem?
A ducted or centrally located dehumidifier may provide better distribution and drainage for a larger recurring load.
Water Intrusion?
Seepage, leaks and wet materials need source correction. Mechanical dehumidification should not be the only response.
INDOOR POOLS & HIGH-MOISTURE SPACES
A natatorium is not a residential dehumidifier application.
Indoor pools create continuous evaporation and require coordinated control of humidity, temperature, ventilation, air distribution and building-surface conditions. These projects should be approached as complete mechanical systems rather than by adding a conventional residential dehumidifier.
MAINTENANCE
Dehumidifiers need drainage, filtration and refrigeration components maintained.
Maintenance requirements vary by manufacturer and model, but filters, condensate drainage, coils and controls should remain clean, accessible and functional.
Air Filter
Inspect and clean or replace the filter according to the manufacturer’s requirements.
Condensate Drain
Inspect accessible drainage components for proper routing, blockage or leakage.
Coils & Airflow
Keep accessible heat-transfer surfaces and airflow paths in suitable condition for operation.
Controls
Review humidity settings and operation as seasonal conditions and building use change.
HUMIDIFIER OR DEHUMIDIFIER?
They solve opposite moisture problems.
TOO DRY
Whole-Home Humidification
Add controlled moisture during conditions where indoor relative humidity is genuinely too low.
TOO HUMID
Whole-Home Dehumidification
Remove excess moisture when the building has a recurring latent load that warrants dedicated humidity control.
WHY DAVESDUCTS?
Humidity control should be evaluated with the HVAC system and the building.
DAVESDUCTS works across HVAC equipment, ductwork, ventilation and indoor air quality. That makes it possible to consider why the humidity is high and how a dehumidifier would interact with the rest of the mechanical system before equipment is selected.
HVAC Evaluation
Consider cooling operation, airflow, heat pumps and air handlers as part of the humidity-control strategy.
Duct Integration
Plan appropriate duct connections, transitions and distribution for applicable whole-home systems.
Ventilation
Consider HRV/ERV operation and outdoor-air moisture instead of treating ventilation and dehumidification separately.
IAQ Approach
Separate moisture control from filtration, duct cleaning and other indoor-air-quality concerns so the solution matches the problem.
WHOLE-HOME DEHUMIDIFIER FAQ
Common questions about controlling excess indoor humidity.
What does a whole-home dehumidifier do?
A whole-home dehumidifier removes moisture from indoor air using a refrigeration process and drains the condensed water away. Drier processed air is then returned to the building through the designed air-distribution arrangement.
How do I know if I need a dehumidifier?
Start with reliable indoor relative-humidity measurements and determine when and where the problem occurs. Persistent elevated humidity, a damp basement or inadequate moisture removal from the cooling system can justify further investigation.
What indoor humidity should I maintain?
There is no single setting appropriate for every building and season. The target should consider comfort, condensation risk, outdoor conditions and the building. Persistent relative humidity above about 60% is generally a reason to investigate moisture control and sources.
Does my air conditioner already dehumidify?
Yes. Air conditioners remove moisture as they cool, but the amount depends on coil conditions, airflow, runtime, sizing and controls. A home can satisfy the temperature setpoint before achieving the desired humidity.
Why is my house humid even though the air conditioner is running?
Possible contributors include a high latent load, short cooling cycles, airflow or control conditions, outdoor-air infiltration, basement moisture, ventilation or other moisture sources. The cause should be investigated before assuming the answer is a larger dehumidifier.
Can a whole-home dehumidifier work with a heat pump?
Potentially, yes. The dehumidifier should be selected and controlled around the heat pump or air-handler configuration, airflow and manufacturer’s installation requirements.
Can a dehumidifier help a damp basement?
Yes, when excess airborne moisture is the problem. If the basement has active seepage, plumbing leaks or wet building materials, those sources should also be corrected.
Should I use a portable or whole-home dehumidifier?
A portable unit may be appropriate for a localized room or basement area. Whole-home equipment can make more sense when the moisture load affects a larger area and suitable ducting, drainage and installation space are available.
Does an ERV replace a dehumidifier?
No. An ERV transfers a portion of moisture between ventilation airstreams, but it is not a conventional refrigeration dehumidifier. Whether dedicated dehumidification is needed depends on the actual moisture load and building conditions.
Can a dehumidifier fix mold?
A dehumidifier can help control airborne moisture, but it does not remove existing mold or correct the water source that caused growth. Water intrusion and affected materials require appropriate source correction and remediation where necessary.
Does a whole-home dehumidifier require a drain?
Yes, condensate removed from the air must be discharged through an appropriate gravity drain or condensate-pump arrangement according to the equipment and installation.
Does DAVESDUCTS install AprilAire whole-home dehumidifiers?
DAVESDUCTS offers AprilAire whole-home dehumidification solutions and will confirm the current model and capacity appropriate to the application before quoting the installation.
Does DAVESDUCTS install whole-home dehumidifiers in Toronto and the GTA?
Yes. DAVESDUCTS provides applicable whole-home dehumidification consultation, installation, replacement and service throughout Toronto and the Greater Toronto Area.
WHOLE-HOME DEHUMIDIFICATION • TORONTO & THE GTA
High humidity? Find out why before adding equipment.
DAVESDUCTS can evaluate the moisture concern, HVAC system, ventilation, ductwork and installation requirements and determine whether whole-home dehumidification is the appropriate next step.
