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Comfort-D Dehumidiers are designed for installing as a Whole House Dehumidi-
er, but in some instances, Spot Dehumidication may be necessary. See below
for the type of installation that best ts the situation:
Whole Home Dehumidier Installations:
In a Basement or Crawl Space with an Existing Forced Air HVAC System
If the structure in which the Comfort-D System is to be installed has an existing
forced air HVAC system, utilize the HVAC system to make the Comfort-D System
installation easier and provide better system performance�
Basement or Crawl Space Installation: Install a separate 8" (D75) or 10” (D95)
return for the Comfort-D in a central area of the structure or if the return ducting is
adequate tap into the existing return duct system near the return air grill. Duct the
supply of the Comfort-D System to the return ducting of the existing HVAC system.
(See diagram on next page.) The fan interlock provision must be utilized for proper
system performance�
In an Attic with an Existing Forced Air HVAC System
ALWAYS install a secondary drain pan with a drain or oat interrupt for condensa-
tion under the Comfort-D in an attic to prevent condensate overow that may drip
down, damaging the ceiling or living space below�
Install a separate 8" (D-75) or 10” (D-95) return for the Comfort-D in a central area
of the structure or if the return ducting is adequate, tap into the existing return duct
system near the return air grill� Duct the supply of the Comfort-D System to the
return ducting of the existing HVAC system. The fan interlock provision must be
utilized for proper system performance�
Installation in a Structure with Two Forced Air HVAC Systems
Attach the Comfort-D return to an independent return from the upper level� At-
tach the Comfort-D supply to the return of the basement HVAC system. This will
promote circulation of air through the whole structure from the upper level to the
lower level through the Comfort-D. If the Comfort-D is not connected to both HVAC
systems, it may not control the humidity of the entire structure� The fan interlock
provision should be connected to the lower, ducted, HVAC system and must be
utilized for proper system performance�
Installation in a Structure with No Existing Forced Air HVAC System
When installing the Comfort-D in a structure that does not have a forced air HVAC
system, a single return for the Comfort-D should be installed in central open area
of the structure� DO NOT locate the return in a bathroom or a kitchen� The supply
of the Comfort-D should be located in the remote areas of the structure (such as
bedrooms, den, etc...). By ducting this way, the air inside the structure will circu-
late through the Comfort-D to be ltered and dehumidied. 5" (D75) or 6" (D95)
diameter duct is recommended for branches to the bedrooms, 6" (D75) or 8" (D95)
diameter duct is recommended for branches to larger areas�
Install Location
