Sources of Humidity• People and their activities – account for 25 lbs

of moisture a day• New building materials• Weather / Environment• Ventilation

– Natural infiltration– Mechanical ventilation

• Other sources– Crawlspaces and basements.– Cleaned carpets, pools and spas

Controlling Humidity…Why?

• For Your Family’s Health• For Your Family’s Comfort• For Your Home’s Sustainability

Health

Ohio State University says, “High humidity

levels in the home contribute to the growth of allergy

causing mold, bacteria and dust

mites”

According to a 2007 EPA study: “Public health and economic impact of dampness and mold”

• Attributed to an estimated 4.6 million cases of asthma• Attributed to annual cost of asthma estimated to be

$3.5 Billion.

Health

ASHRAE Comfort Window

Building Science Corporation

• People are most comfortable when relative humidity range is between 25 – 60%.

• Recommends dehumidification separate from cooling in hot, humid climates

Comfort

Comfort

Reducing Humidity means Reducing…

• Stuffy / Clammy Feeling• Musty Basements• Condensation on Vents and

Inside Windows• Mold Growth Opportunity• Sleepless Nights• Overcooling to attempt to get comfortable

Controlling Humidity

• What factors do I need to take into account?• How then do I optimally control humidity?• Where can I find value-added benefits?

…First, we need to understand the situation at hand…

Understanding the Situation

• What type of home construction?– Icynene / Foam Seal– “Tight” Home– Radiant / Moisture Barriers– Moisture in Materials

• What type of equipment is present?– HVAC sizing/type– Ventilation / Bathroom Fans– Gas Appliances / Direct Vented– Dishwasher– Washer / Dryer

Understanding the Situation

• How many occupants in the home?– During the day– During the night

• What type of activities?– Cooking Day/Night– Washing Day/Night– Etc

Understanding the Situation

Are there times during the year where the temperature is between 60F and 75F and the humidity level is high enough to be uncomfortable and/or affect my indoor air quality negatively?

Understanding the Situation

Are there times during the day where the temperature is between 60F and 75F and the humidity level is high enough to be uncomfortable and/or affect my indoor air quality negatively?

• Evenings?• Mornings?

Important Questions…Why?

• Efficient home construction – Energy Star– “Seal up” the home keeping in the cooling/heating– Most efficient heating & cooling equipment today– Sustainability right?

• Concern the indoor air quality is worse indoors than it is outdoors– How do we handle the moisture and other pollutants

that are trapped inside?– What direction do we go?

Important Questions…Why?

Variable-speed central air conditioners do a good job of air conditioning while they are running– What about the times during the year where we don’t

need to cool but the humidity indoors is high?– Do we typically overcool?– Peak-sized A.C. / Partial-Load Conditions– Advanced humidity controls help, but less efficient

system

Important Questions…Why?

Using a ventilation strategy helps…– If no fresh air ventilation is used, what typically happens

when the bathroom fans / direct-exhaust operate?

Not enough make-up air available Negative pressurization Back-drafting can occur

– If there is fresh air ventilation, what is done to treat the air in humid climates or conditions?

Important Questions…Why?

Ventilation per ASHRAE 62.2 2007…B2.1– “High-volume fans such as the air handler and some cooking

exhaust fans can cause high levels of depressurization, particularly in homes of tight construction.”

– “Depressurization of the living space relative to outdoors may cause back-drafting of combustion appliances and the migration of contaminants…into the living space. Depressurization can also result in moisture intrusion into building cavities in hot, humid climates, potentially causing structural damage and fungal growth.”

Important Questions…Why?

Ventilation per ASHRAE 62.2 2007…B3.3– “Residences with high-performance glazing systems and

thermally efficient roof and wall assemblies can have sensible loads sufficiently low so that traditional air-conditioning systems can have trouble providing humidity control. Under partial load conditions, the required outdoor air and occupant activities will often produce a larger latent load that can be handled by the air-conditioning systems. Under such circumstances, independent dehumidification control should be used.”

Central Dehumidifiers

The Optimal Solution…

+ Central Air Conditioning

Central Dehumidifiers

Model 1750 – 90 pints per day

Model 1770 – 150 pints per day

The Optimal Solution…

Key Feature / Benefits

• 5 Year bumper-to-bumper Warranty• Extreme Durability & Reliability

– Highly Accelerated Life Testing 15+ year life expectancy for system

• Vibration Frequencies• G-Force up to 60g

– Coastal Environment Testing Board location & coatings• Corrosion• Performance

Key Feature / Benefits• Automatic Control & Monitoring

– Automatic air sampling to monitor moisture in the home, looks at Dew Point conditions

– Can turn on HVAC blower in conjunction (Recommended)• LED Status – simple diagnostics• Air Cycling – can operate the HVAC blower for air cycling & air filtration if

needed• Ventilation Capabilities – operate damper and the HVAC blower for

bringing in outside fresh air• Living Space Control – option to remotely monitor and adjust comfort

level within the home

Specifications Aprilaire Model 1750 Aprilaire Model 1770Capacity 3.91 lbs/hr (90 pints/day) @ 80°F & 60% RH 6.51 lbs/hr (150pints/day) @ 80°F & 60% RH

Voltage 120/1/60 120/1/60

Amp Draw 8 amps 14 amps

Air Flow 275 cfm @ .6" E.S.P 500 cfm @ .8" E.S.P (EST)

Filter 1" Washable, Merv 8 1" Washable, Merv 8

Controls Built-In Automatic Control or Space Control Built-In Automatic Control or Space Control

Cabinet Insulation 1" Foil Paced Expanded Polystyrene 1" Foil Paced Expanded Polystyrene

Inlet Temperature Range 40°F - 105°F 40°F - 105°F

Inlet Humidity Range 30% RH - 100% RH 30% RH - 100% RH

Ambient Operating Temperature Range 40°F - 150°F 40°F - 150°F

Ambient Operating Humidity Range 0% RH - 100% RH 0% RH - 100% RH

Discharge Air Temperature 103°F @ 80°F and 60% RH 103°F @ 80°F and 60% RH

Discharge Air Relative Humidity 25% RH @ 80°F and 60% RH 25% RH @ 80°F and 60% RH

Refrigerant Type R-22 R-22

Sound Level 48 dBA Ducted; 54 dBA Non-Ducted 53 dBA Ducted; 67 dBA Non-Ducted

Weight 92 lbs. 100 lbs

Dehumidifier Product Specifications

Aprilaire vs. Portables

Leading Portables

• At least 2X the capacity• TXV design• High Performance Professional-Grade

Aprilaire vs. Portables

Leading Portables

More Efficient

Energy Savings

Aprilaire vs. Portables

• Super Quiet (48dB / 54dB)• No Drain Trays to Empty• Application & Installation Flexibility

– Ducted & Non-Ducted– Living Space Duct Kit– Condensate Pump Option

Key Highlights to Remember

• Reliability & Durability• Performance / Professional-Grade• Automatic Dew Point Control• LED Status• Application & Installation Flexibility

Aprilaire Resources

• Aprilaire phone support staff 1-800-334-6011

• Consumer web site www.aprilaire.com

• Distributor / Dealer / Contractor web-site www.aprilairepartners.com

• Aprilaire District Sales Manager

• Me

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