Most dehumidifiers sit on the floor and empty into a bucket. A wall mounted dehumidifier, in wall dehumidifier or ceiling mounted dehumidifier is a permanent install instead: it hangs out of the way, drains through a pipe and usually has its controls set once and left alone. That suits finished basements, home theaters, garages, workshops and apartments, where a portable unit would be in the way or forgotten.
The choice is small. True in-wall residential units are rare, and most permanent options are whole-home or crawl space units with a hanging kit.
| Mounting type | How it installs | Example | Best for |
|---|---|---|---|
| In-wall | Fits between studs, flush with the wall | Santa Fe UltraMD33, Innovative IW25-6 (in-wall version) | Finished basements, apartments |
| On-wall (surface mount) | Hangs on the wall surface | Innovative IW25-6 on-wall, UltraMD33 with surface kit | Garages, workshops, utility rooms |
| Ceiling or joist hung | Hangs from joists or a ceiling | Aprilaire E-series with hanging kit, Quest overhead units | Unfinished basements, grow rooms |
| Ducted whole-home | In a mechanical room, ducted to living spaces | Aprilaire, Santa Fe Ultra | Whole house |
Wall and ceiling dehumidifiers compared
| Pick | Capacity | Coverage | Pump | Noise | ENERGY STAR | Price tier | |
|---|---|---|---|---|---|---|---|
| Best in wall dehumidifier Santa Fe UltraMD33 | 33 pints/day (AHAM 80F) | Up to 1,200 sq ft (Amazon listing) | No | Not published | Not stated | $$$$$ | Check price |
| Best on-wall dehumidifier Innovative IW25-6 On-Wall | 40 pints/day (AHAM 80F) | Up to 1,500 sq ft (maker) | No | Not published | Not stated | $$$$$ | Check price |
| Best ceiling mounted dehumidifier Aprilaire E100 | 100 pints/day (AHAM 80F) | Up to 5,200 sq ft (maker FAQ); Amazon listing says up to 5,500 sq ft | No | Not published | Yes | $$$$$ | Check price |
| Best overhead high-capacity Quest 155 | 155 pints/day (AHAM 80F) | Not stated | Not stated | Not published | Not stated | $$$$$ | Check price |
| Best hang-anywhere crawl unit AlorAir HDi65S | 55 pints/day (AHAM 80F) | Up to 1,300 sq ft (maker claim) | Yes | Max 52 dB (Sylvane listing) | Not stated | $$$$$ | Check price |
Best in wall dehumidifier
Santa Fe UltraMD33 In-Wall Dehumidifier
Best for: finished basements, apartments and home theaters.
Santa Fe calls the UltraMD33 the first true in-wall dehumidifier designed to drain directly into a hub drain or plumbing line. It removes up to 33 pints a day according to its listing, is sized for up to 1,200 sq ft, and has a digital humidity control behind a tamper-proof cover, which is why it is popular in apartments and multi-family buildings. It can be hardwired or plugged into a 110 V outlet, and a separate surface mount kit lets you hang it on a wall instead.
| Model number | UltraMD33 (4044610) |
|---|---|
| Type | Wall-mounted compressor |
| Capacity (AHAM test, 80F, 60% RH) | 33 pints/day |
| Coverage | Up to 1,200 sq ft (Amazon listing) |
| Built-in pump | No |
| Wi-Fi / app | No |
| ENERGY STAR | Not stated |
| Noise | Not published |
| Install | Fits in a wall cavity; a separate surface mount kit (4037766) mounts it on a wall |
| Drain | Drains directly to a hub drain or plumbing line |
| Power | Hardwire or plug into a 110 V outlet with the supplied cord |
| Controls | Digital RH control behind a tamper-proof cover |
| Size | 5.75 x 14.18 x 30 in |
| Price tier | Pro (about $900 and up) |
Pros
- True in-wall design
- Drains to plumbing
- Tamper-proof control
Cons
- Needs a wall cavity and a drain
- Pro price tier
Spec sources (checked 2026-11-12): Amazon listing B0DS2VPWL3 (Model Number 4044610); Amazon listing B09CLP4NJW (Santa Fe surface mount kit 4037766).
Best on-wall dehumidifier
Innovative Dehumidifiers IW25-6 On-Wall Dehumidifier
Innovative Dehumidifiers' IW25-6 comes in on-wall and in-wall versions. The specification sheet gives 40 pints a day at 80F and 60% RH and 24 pints at 65F and 60% RH, coverage up to 1,500 sq ft, and an operating range of 46F to 95F. It drains through a hose. It is usually sold through HVAC suppliers, so the Amazon link searches for it.
Heads up: Often sold through HVAC suppliers rather than Amazon; the Amazon link searches for it.
| Model number | IW25-6 (on-wall) |
|---|---|
| Type | Wall-mounted compressor |
| Capacity (AHAM test, 80F, 60% RH) | 40 pints/day |
| Coverage | Up to 1,500 sq ft (maker) |
| Built-in pump | No |
| Wi-Fi / app | Not stated |
| ENERGY STAR | Not stated |
| Noise | Not published |
| Low-temperature operation | 46F to 95F operating range (retailer spec table) |
| Capacity at 65F, 60% RH | 24 pints/day |
| Install | Hangs on a wall and drains through a hose; an in-wall version also exists |
| Price tier | Pro (about $900 and up) |
Pros
- On-wall and in-wall versions
- Published ratings at two conditions
Cons
- 46F minimum
- Hard to find at retailers
Spec sources (checked 2026-11-11): SupplyHouse listing IW25-6 on-wall; Innovative IW25-6 specification sheet (June 2026); Sylvane: Innovative On-Wall dehumidifier.
Best ceiling mounted dehumidifier
Aprilaire E100 Whole-Home Dehumidifier
For an unfinished basement, the most practical ceiling dehumidifier is a whole-home unit hung from the joists. Amazon sells Aprilaire E100 bundles with a hanging kit and pump. The E100 removes 100 pints a day at 80F (85 on ENERGY STAR's test), moves 280 CFM and is ENERGY STAR Most Efficient. Hung up high with a short duct or two, it dries the whole basement and keeps the floor clear.
Heads up: Sold on Amazon as well as through HVAC contractors. Ducted installs should be done by a pro.
| Model number | E100 |
|---|---|
| Type | Whole-house (ducted or ventilating) |
| Capacity (AHAM test, 80F, 60% RH) | 100 pints/day |
| Coverage | Up to 5,200 sq ft (maker FAQ); Amazon listing says up to 5,500 sq ft |
| Built-in pump | No |
| Wi-Fi / app | No |
| ENERGY STAR | Yes |
| Noise | Not published |
| Airflow | 280 CFM (Amazon listing) |
| Weight | 64 lb |
| Sizing note | Aprilaire sizes by climate region and how airtight the home is; ask the installer to run its Dehumidifier Selection Assistant |
| Capacity at 73F, 60% RH | 85 pints/day (Aprilaire spec sheet) |
| ENERGY STAR test data | 85.0 pints/day, IEF 2.35 L/kWh, about 821 kWh/yr; meets ENERGY STAR Most Efficient (record for E100) |
| Price tier | Pro (about $900 and up) |
Pros
- High capacity
- Hanging kit bundles available
- ENERGY STAR Most Efficient
Cons
- 64 lb to lift into place
- Pro price tier
Spec sources (checked 2026-11-12): Aprilaire dehumidifier FAQ (ppd and sq ft); Aprilaire E-series guide, Nov 2025 (ppd, weights); ENERGY STAR certified product record (E100); Amazon listing B094PZ8YSK (AprilAire E100 Pro); Aprilaire E100 specification sheet (CFM by static pressure).
Best overhead high-capacity unit
Quest 155 Dehumidifier
Quest's overhead Dual series is designed to hang from the ceiling. The Quest 155 removes 155 pints a day at 80F and 60% RH at 8.5 pints per kWh. It is built for grow rooms and commercial spaces and needs a 208 to 240 V supply on larger models.
Heads up: Sold mainly through hydroponics and HVAC suppliers; the Amazon link searches for it.
| Model number | 155 |
|---|---|
| Type | Commercial compressor (high capacity) |
| Capacity (AHAM test, 80F, 60% RH) | 155 pints/day |
| Coverage | Not stated by maker |
| Built-in pump | Not stated |
| Wi-Fi / app | Not stated |
| ENERGY STAR | Not stated |
| Noise | Not published |
| Efficiency | 8.5 pints/kWh at 80F, 60% RH (Sylvane listing) |
| Mounting | Overhead (Quest Dual series) |
| Price tier | Pro (about $900 and up) |
Pros
- Overhead design
- Very high capacity
Cons
- Commercial unit
- Sold through suppliers
Spec sources (checked 2026-11-12): Quest Indoor Farming brochure; Sylvane: Quest 225 high-efficiency dehumidifier; Hydrobuilder: Quest 225 listing.
Best hang-anywhere crawl unit
AlorAir Sentinel HDi65S Crawl Space Dehumidifier with Pump
Compact crawl space units can be strapped up or set on a shelf. The AlorAir Sentinel HDi65S weighs 44 lb, has a pump and Wi-Fi, and runs down to 33.8F, which makes it a good permanent unit for a cold garage or crawl space.
| Model number | HDi65S |
|---|---|
| Type | Compressor (crawl space / basement, low temp) |
| Capacity (AHAM test, 80F, 60% RH) | 55 pints/day |
| Coverage | Up to 1,300 sq ft (maker claim) |
| Built-in pump | Yes |
| Wi-Fi / app | Yes |
| ENERGY STAR | Not stated |
| Noise | Max 52 dB (Sylvane listing) |
| Low-temperature operation | 33.8F to 104F operating range (maker) |
| Capacity at saturation (90F, 90% RH) | 120 pints/day |
| Airflow | 130 CFM |
| Size / weight | 19.2 x 12.2 x 13.3 in, 44 lb |
| Warranty | 6-year limited (Amazon listing) |
| Price tier | Pro (about $900 and up) |
Pros
- Pump
- Low-temp
- Wi-Fi
Cons
- Needs a solid mount
Spec sources (checked 2026-11-11): AlorAir product page HDi65S; AlorAir HDi65S spec sheet; Sylvane listing (noise, low temp).
Permanent dehumidifier for basement
A permanent dehumidifier for basement use is worth it if your basement is damp every summer and you are tired of carrying buckets. A built in dehumidifier for basement spaces that drains to a floor drain or sump runs for years with only filter cleaning. The options, from simplest to most involved:
- A portable unit with a pump or hose, set on a shelf. Cheapest and almost permanent.
- A crawl space or whole-home unit hung from joists, draining to a pump or floor drain.
- An in-wall unit like the UltraMD33, plumbed into a hub drain.
- A ducted whole-home system tied into the HVAC.
| Condition before dehumidifying | Room under 2,000 sq ft (pints/day) | Space over 2,000 sq ft (pints/day) |
|---|---|---|
| Slightly to moderately damp feels damp, musty odor at times; about 50 to 75% RH | 20 to 30 | 30+ |
| Very damp always feels and smells damp, damp spots on walls or floor; about 75 to 90% RH | 25 to 40 | 40+ |
| Wet walls or floor sweat, seepage, laundry drying; about 90 to 100% RH | 30 to 50 | 50+ |
Source: ENERGY STAR dehumidifier buying guidance. ENERGY STAR adds: "it's better to oversize than undersize."
Install basics
| Step | What to check |
|---|---|
| Drain | A floor drain, sump or hub drain below the unit, or a condensate pump |
| Power | A nearby outlet or a circuit for hardwiring (hire an electrician to hardwire) |
| Mounting | Joists or studs that can carry the weight; vibration pads or straps from the maker's kit |
| Airflow | Clearance around intake and exhaust per the manual |
| Access | Room to reach the filter and controls |
| Temperature | The unit's minimum operating temperature versus your coldest month |
Wall mounted vs portable
| Wall or ceiling mounted | Portable | |
|---|---|---|
| Floor space | None | Takes floor space |
| Drainage | Plumbed or pumped | Bucket, hose or pump |
| Cost | Pro tier plus install | Value to mid tier |
| Flexibility | Fixed | Move it anywhere |
| Best for | Permanent damp spaces | Seasonal or single-room use |
Frequently asked questions
Can you mount a dehumidifier on a wall?
Is a permanent dehumidifier worth it?
Where do you install a ceiling dehumidifier?
Sources
- Innovative IW25-6 specification sheet
- ENERGY STAR: Dehumidifiers buying guidance and sizing chart