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Aprilaire #4655 Humidistat image
 
(based on 36 ratings)
Brand: Aprilaire
Located in: Humidity Control, Humidifiers, Whole House Humidifiers, Whole House Humidifier Parts By Model, Aprilaire Humidifier Parts, Aprilaire Model 110
The Aprilaire 4655 Humidistat is designed for low voltage service to control humidification equipment. An increase in relative humidity expands the nylon ribbon which opens the control switch to stop operation of the humidifier. A decrease in relative humidity reverses the process and closes the control switch. Can be wall mounted or mounted on return plenum. Includes plenum cutout template (4 5/32" X 2 7/16"). For duct mount, locate at least 6" upstream of humidifier, humidifier bypass ductwork or fresh air intake ductwork. Specifications Range - 15% to 50% Operating Differential - 8% RH Maximum Dimensions - 5 1/8" W X 3 3/8" H X 1 15/16" D Electrical Data - SPST Switch 2 Wires 24 VAC Max. Load (contacts) - 5.2 Amps For use with models: 110, 112, 220, 224, 350, 360, 400, 440, 445, 445A, 448, 500, 550, 558, 560, 560A, 568, 600, 700, 760, 760A and 768
Review Snapshot®
Avg. Customer Rating:
 
4.3 stars
(based on 36 reviews)
97% of respondents would recommend this to a friend.

Customers most agreed on the following attributes:

Pros:
Adjustable settings(14), Durable(4), Easy to install(3), Easy to use(10), Energy efficient(4)
Best Uses:
Dry winter(14), Whole house humidifiers(12)
Describe Yourself:
Avid do-it-yourselfer(3), Homeowner(32)
 
Excellent Purchase
By MOVerified Purchaser from Chicagoland on 1/5/2011
Pros:
Durable, Energy Efficient, Good Fit
Best Uses:
Whole House Humidifiers
Describe Yourself:
Handyman, Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

A much needed replacement item for our system, which is working well.

 
worked and looked great
By brock the buckeyVerified Purchaser from ohio on 1/4/2011
Pros:
Good Fit, Looked good
Best Uses:
Whole House Humidifiers
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

fit over old outdated system perfectly. looks and works much better

 
Excellent
By JoelVerified Purchaser from Godfrey, Il on 12/15/2010
Best Uses:
Whole House Humidifiers
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

perfect fit

 
Replacement for older unit
By DeanVerified Purchaser from Michigan on 11/28/2010
Best Uses:
Whole House Humidifiers
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

Had to resize hole on return air duct to replace old unit. Due to location this was a little tricky, but that would be a problem created by the original installer. However, some sort of adapter plate would be a handy accessory.

[1 of 1 customers found this review helpful]

 
Easy to Install
By cdbVerified Purchaser from michigan on 3/8/2010
Pros:
Durable, Good Fit
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

Replaced a very old humidistat with this model. Very easy to install and works much better than the old one.

 
Unit worked
By BriguyVerified Purchaser from Fort Wayne, IN on 3/2/2010
Pros:
Durable, Good Fit
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

This unit was fairly easy to hookup and came with wall anchors. This was the cheapest place that I could find on the internet that looked have way legit with my credit card information.

 
Humidistat replacement
By BrianVerified Purchaser from St. Charles, MO on 2/26/2010
Pros:
Good Fit
Best Uses:
Whole House Humidifiers
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

Very easy to replace

 
Good Stuff
By RafeVerified Purchaser from Chicago on 2/19/2010
Pros:
Good Fit
Best Uses:
Whole House Humidifiers
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

Arrived just as advertised and works like it's supposed to.

 
Easy to install and worked immediately
By handy homeownerVerified Purchaser from Massachusetts on 2/8/2010
Pros:
Good Fit
Best Uses:
Whole House Humidifiers
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

Replaced one that was 15 years old that had stopped working though it was receiving power from the 24v transformer. The footprint was slightly different, so I had to get out my metal shears to set it into the return. The old one was mounted flush. I noticed that the ribbon technology in the new product was identical to the old one.

[1 of 1 customers found this review helpful]

 
Easy update to an old eyesore!
By DIY Homeowner in OhioVerified Purchaser from Ohio on 1/7/2010
Pros:
Durable, Easy to install, Easy to use, Good Fit
Best Uses:
Whole House Humidifiers
Describe Yourself:
DIY, Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

We purchased this humidistat control to replace an old brown control that was an eyesore. We have an Aprilaire 550 whole house humidifier and this new humidistat was easy to install - in fact it was identical to the original control. Just a quick switch of wires and that was it! We're thrilled with our purchase and know this was an easy update that will help with our homes resale value.

[0 of 1 customers found this review helpful]

 
basic, no frills , easy install
By chicago suburbsVerified Purchaser from chicago,il on 12/21/2009
Pros:
Adjustable Settings, Easy To Use
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

This new control replaced an older model that failed during a new furnace install. Simple and easy to install.

[0 of 1 customers found this review helpful]

 
As advertised
By BobVerified Purchaser from Altoona, Pa on 12/9/2009
Pros:
Adjustable Settings, Easy To Use
Best Uses:
Dry Winter
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

The humidistat was easy to install and worked out of the box.

 
Solid product easy to install
By Valley BillVerified Purchaser from Apple Valley. MN on 11/10/2009
Pros:
Easy To Use
Best Uses:
Dry Winter
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

Directions were clear and the product is simple to use

 
Easy order. Product works as advertised
By REBVerified Purchaser from Mystic, CT on 10/24/2009
Pros:
Easy To Use
Best Uses:
Dry Winter
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

Product very simple. Works as advertised. I was replacing an older unit that had a larger opening in the duct, so I had to cut a larger piece of sheet metal to cover the larger hole, then made a cutout the correct size.

 
Be prepared to improvise
By Runner DeanVerified Purchaser from Solon, Ohio on 10/22/2009
Pros:
Adjustable Settings
Cons:
Size didn't match
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

The unit works just fine, but I had to improvise because the new unit did not fit over the "cut out" in the plenum in exactly the same fashion as the old one. I was able to use part of the old unit's "plate" to install. Don't know why they change sizes on these things.

 
high quality
By BobVerified Purchaser from Freeland,Maryland on 9/14/2009
Pros:
Easy To Use
Best Uses:
Dry Winter
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

replacement for humistadt from #560. It needed to have a different size duct opening that I had to cut with a dremel.The dremel made it much easier. Works perfect.

[1 of 1 customers found this review helpful]

 
[...]
By PaveVerified Purchaser from Randolph NJ on 3/17/2009
Pros:
Ten minute install
Cons:
None
Best Uses:
Whole House
Describe Yourself:
Handy homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

Absolutely delighted to be able to get an exact replacement.

[3 of 3 customers found this review helpful]

 
It does not fit the old cut-out
By 30allVerified Purchaser from NJ on 3/14/2009
Best Uses:
Dry Winter
Describe Yourself:
Homeowner

Comments about Aprilaire Aprilaire #4655 Humidistat:

This new control does not fit the old model cut-out , frame, flange and box originally installed with 550, luckily, the gut of control is still the same, so I had to take them apart and use only gut part in the new control and use the box and frame of old one.

 
WORKS GREAT
By Joe the plumberVerified Purchaser from Gansevoort,NY on 3/7/2009
Pros:
Adjustable Settings, Easy To Use, Lightweight, Quiet
Best Uses:
Dry Winter
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

The humidistat works great. I was able to fix the problem on my furnace and save alot of money.

Service & Delivery comments:

The service is terrific. I had the item very quickly.

[2 of 2 customers found this review helpful]

 
humidistat
By DonVerified Purchaser from Long Island, NY on 3/3/2009
Pros:
Lightweight, Quiet
Describe Yourself:
Homeowner, Professional
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

manual operation, wish I spent the extra money and bought the automatic model

 
Good product for cost
By TMVerified Purchaser from IL on 2/25/2009
Pros:
Adjustable Settings, Easy To Clean, Lightweight, Quiet
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

Entire Home Humidifer- happy with product, easy to install- the model I purchased was a upgraded humidistat but was still no problem installing in the same place old model was!

 
Perfect Replacement
By ChrisVerified Purchaser from NJ on 2/24/2009
Pros:
Adjustable Settings, Easy to Install, Very nice design
Cons:
No cons
Best Uses:
Accurate Humidity Setting, Dry Winter
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

Very good replacement for my old humidistat. Easy to install, looks very good, works accurately.

 
Aprilaire 4655 Humidistat grade A++++++
By SenkoclubVerified Purchaser from MI on 2/24/2009
Pros:
Adjustable Settings, Energy Efficient, Lightweight, Quiet
Best Uses:
Dry Winter
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

The product is used to power my Aprilaire Humidifier. It is easy to install and works every time the furnace comes on.

Service & Delivery comments:

The delivery was very prompt, and the product arrived in good condition.

 
Easy replacement
By KerryVerified Purchaser from Salt Lake City, UT on 2/24/2009
Pros:
Adjustable Settings
Best Uses:
Dry Winter
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

This was just a replacement for one of my Aprilaire humidifiers. Simple to install.

 
A nice update
By Jobs always longerVerified Purchaser from State of Confusion on 2/7/2009
Pros:
Adjustable Settings, Easy To Use, Lightweight, Quiet
Cons:
Didn't fit old mounting
Best Uses:
Dry Winter
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

Replaced old nonfunctional Aprilaire 440 humidistat. The 4655 didn't fit up to the 440 opening and mounting hole. Had to make an adaptor plate with smaller cutout and hole pattern. Looks like a professional job. The new humidistat looks nice.

 
SAME PART DIFFERENT HOLDER
By NAVerified Purchaser from Woodbridge VA on 1/29/2009
Pros:
Easy To Use
Best Uses:
Dry Winter
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

I had an old humidity controller and was afraid the new one would work without cutting a new hole. The new controller fit inside the old holder just great. I am glad they used a standard part inside a new holder.

[2 of 2 customers found this review helpful]

 
Good Product
By RobertVerified Purchaser from Michigan on 1/8/2009
Pros:
Adjustable Settings, Easy To Use
Cons:
No wiring instructions
Best Uses:
Dry Winter
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

The humidistat is easy to use and is more attractive than the older model. It looks fine in my dining room. The installation instructions did not include wiring instructions ie which screw was for which wire. Fortunately I copied the connections from the old humidistat and they worked.

 
easy to install works fine
By Roger BVerified Purchaser from Hellertown Pa on 12/30/2008
Pros:
Adjustable Settings
Best Uses:
Living Room
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

pretty simple unit really. Install set and forget.

 
Aprilaire 4655 Humidistat is Excellent
By ZGHP01Verified Purchaser from Mt Prospect, IL on 12/17/2008
Pros:
Adjustable Settings
Describe Yourself:
Handyman
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

I replaced a old Aprilaire Humidistat that was not working with this new model. It works just fine with my Aprilaire model 550 Humidifer.

 
Nice product
By RBVerified Purchaser from Massachusetts on 12/4/2008
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

Replaced the humidistat that was mounted on the Furnace with this one that I located next to my thermostat in the dining room. Works and loks good.

[1 of 1 customers found this review helpful]

 
[...] great price
By noneVerified Purchaser from Chicago, Il on 12/3/2008
Pros:
Adjustable Settings, Easy installation, Energy Efficient
Best Uses:
Dry Winter, Living Room
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

Wanted to get rid of old looking aged plastic unit after decorating room over.

[1 of 2 customers found this review helpful]

 
Nice Stat everyone
By oldrzbtrVerified Purchaser from Ft. Wayne In. on 8/27/2008
Pros:
Adjustable Settings, Energy Efficient
Best Uses:
Dry Winter
Describe Yourself:
Homeowner
Bottom Line:

Comments about Aprilaire Aprilaire #4655 Humidistat:

I was surprised that I was able to find a humisistat that would go with my new thermostat I had just purshased. My old ones were brown. The white ones look much better with my decor and work great.

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