Key takeaways
- Power: most 70–95 pint whole-house units need a dedicated 115 V, 15 A circuit. Check the nameplate amperage against the circuit’s existing load before assuming you can tap the furnace circuit.
- Drainage, in order of preference: gravity to a floor drain or sump; gravity into a condensate line with a trap; condensate pump to a utility sink or outside. Sharing the AC’s condensate line is common but some local codes restrict it.
- Clearances and filter access: leave room to slide the filter out. A clogged filter raises discharge temperature and shortens compressor life more than anything else you control.
- Noise: whole-house units generally land in the 48–60 dBA range at a few feet, which is louder than a modern refrigerator but far quieter than a portable in the same room — and ducting moves the sound source out of living space entirely.
- Cold-weather behavior: below roughly 60°F, expect reduced output and possible coil frost. If your basement sits at 55°F in winter, you want a unit rated for low-temperature operation rather than the cheapest 90-pint box.
For most homes between 2,500 and 3,600 sq ft, the best whole house dehumidifier is the Aprilaire 1850 — a roughly 95-pint-per-day, 115 V unit that ties into existing HVAC supply and return plenums and typically costs $1,500–$2,000 for the unit alone before installation. Homes under about 2,000 sq ft rarely need that capacity and match better to a 70-pint class unit such as the Aprilaire 1830 or Santa Fe Compact70, while cold basements and crawlspaces favor the Santa Fe Ultra98. Every capacity figure below follows the AHAM rating standard of 80°F and 60% RH, which matters because a 65°F basement can cut real output by a third or more.
Quick comparison: five whole-house dehumidifiers
Prices are general U.S. market ranges for the unit only, excluding installation, ducting and any condensate pump.
| Model | Best for | Key specs (manufacturer ratings) | Drainage | Price range |
|---|---|---|---|---|
| Aprilaire 1850 | Best overall, 2,500–3,600 sq ft | ~95 pints/day, 115 V, ducted supply + return, MERV 8 filter | Gravity or pump | $1,500–$2,000 |
| Aprilaire 1830 | Best for 1,500–2,300 sq ft | ~70 pints/day, 115 V, ducted supply + return, MERV 8 | Gravity or pump | $1,000–$1,400 |
| Santa Fe Ultra98 | Best for basements and crawlspaces | ~98 pints/day, up to ~2,600 sq ft, optional MERV 13 filtration | Gravity or pump | $1,600–$2,100 |
| Honeywell TrueDRY DR90 | Best HVAC-integrated retrofit | ~90 pints/day, 6-inch duct collars, 115 V | Gravity or pump | $1,000–$1,500 |
| AlorAir Sentinel HDi90 | Best budget | ~90 pints/day, up to ~2,600 sq ft, built-in condensate pump | Built-in pump | $800–$1,200 |
Best overall: Aprilaire 1850
The 1850 is the capacity sweet spot for a typical two-story suburban house. Per the manufacturer’s spec sheet it removes about 95 pints per day at AHAM conditions and is designed to be ducted into both the return and supply sides of an existing air handler, which means it dehumidifies the whole envelope rather than one room. That ducted arrangement is also what keeps it quiet inside living space — the compressor sits in the basement, utility closet or attic, and air arrives through ordinary registers.
Who it suits: homes with forced-air HVAC, a basement or crawlspace to mount it in, and a gravity drain or a spot for a condensate pump. Main trade-off: it is not a plug-and-play appliance. Expect a licensed HVAC contractor, a dedicated 115 V circuit, and $500–$1,500 in installation labor depending on how much ductwork has to be fabricated.
Best for smaller homes: Aprilaire 1830
The 1830 is the same platform at roughly 70 pints per day, rated for about 2,300 sq ft. In a 1,400–2,000 sq ft ranch with a finished basement, it will hold 45–50% RH without short-cycling, and it draws less current than the 1850, which sometimes means it can share an existing circuit rather than requiring a new run.
Who it suits: condos, townhouses and single-story homes where the 1850 would be oversized and cycle too often. Main trade-off: capacity, not features — in a leaky 3,000 sq ft house in a Gulf Coast climate it simply won’t keep up during the wettest weeks.
Best for basements and crawlspaces: Santa Fe Ultra98
Santa Fe units are built around colder, damper conditions than the average ducted dehumidifier, and the Ultra98 is the model most often specified for encapsulated crawlspaces and unfinished basements. It is rated near 98 pints per day with coverage around 2,600 sq ft, supports MERV 13 filtration, and can be ducted to a single supply register or run free-standing in the space.
Who it suits: homes where the moisture problem is below grade, or where a homeowner wants filtration and dehumidification from one box. Main trade-off: price. It usually runs $1,600–$2,100 for the unit, and crawlspace installs add labor for hanging, draining and ducting.
Best HVAC-integrated retrofit: Honeywell TrueDRY DR90
The TrueDRY DR90 is rated around 90 pints per day and uses standard 6-inch duct collars, which makes it one of the easier units to tie into an existing system without custom sheet-metal work. It also supports wiring to the air handler so the blower runs only when the dehumidifier calls for it.
Who it suits: retrofit jobs where the contractor wants predictable duct geometry and simple controls. Main trade-off: it is a workhorse rather than a feature leader — fewer filtration and control options than the Aprilaire and Santa Fe lines.
Best budget pick: AlorAir Sentinel HDi90
AlorAir sells direct-to-consumer, which is why the Sentinel HDi90 lands near $800–$1,200 with a built-in condensate pump and roughly 90 pints per day of capacity. The built-in pump removes one of the more common installation headaches: no gravity path to a drain.
Who it suits: DIY-adjacent installs in a basement or crawlspace where a contractor’s quote would push the project out of budget. Main trade-off: support and parts availability are thinner than the established HVAC brands, and the pump is the single most failure-prone part of any dehumidifier, so buy where you can get a replacement quickly.
How to size a whole-house dehumidifier (and what it costs to run)
A rough screening rule of thumb is one pint per day of rated capacity for every 25–40 sq ft of conditioned space in a humid climate — so 2,500 sq ft points at 60–100 pints per day, which is why the 95-pint class dominates this category. Treat that as a filter, not a load calculation; a proper Manual J-style moisture load calc accounts for air leakage, duct location, foundation type and outdoor dew point.
The calculation most homeowners actually care about is running cost. Take a 70-pint class unit drawing 6.5 A at 115 V, or about 750 W, and a 95-pint class unit at roughly 860 W. Neither runs continuously; in a moderately humid climate a 40% duty cycle is a reasonable planning assumption.
| Setup | Rated draw | kWh/day at 40% duty | Monthly cost at $0.17/kWh | Pints per kWh at rated output |
|---|---|---|---|---|
| 70-pint whole-house, ducted | ~750 W | ~7.2 kWh | ~$37 | ~3.9 |
| 95-pint whole-house, ducted | ~860 W | ~8.3 kWh | ~$42 | ~4.6 |
| Two 50-pint portables (60% duty) | ~900 W combined | ~13 kWh | ~$66 | Lower in practice — both lose capacity as room temperature drops |
Two numbers worth carrying into the buying decision. First, if the dehumidifier is wired to run the air handler blower, add roughly 200–400 W whenever the fan is on — that is real money over a month and is why the “fan-only when dehumidifying” wiring option matters. Second, condensate volume: 70 pints per day is 8.75 gallons per day, or about 0.36 gallons (1.4 liters) per hour. That flow is small enough for a 3/8-inch gravity line sloped about 1/4 inch per foot, but it absolutely requires a drain path — which is why a condensate pump is mandatory in most crawlspace and attic installs.
Which one for your situation
| Your situation | Pick | Why |
|---|---|---|
| 2,500–3,600 sq ft, forced-air HVAC, humid summers | Aprilaire 1850 | Ducted supply + return treats the whole house; capacity headroom for peak weeks |
| Under 2,000 sq ft, or a condo with one air handler | Aprilaire 1830 | Less cycling, smaller electrical load, lower price |
| Encapsulated crawlspace or damp unfinished basement | Santa Fe Ultra98 | Built for cooler, damper air; can run free-standing or ducted to one register |
| Existing HVAC, contractor wants an easy tie-in | Honeywell TrueDRY DR90 | Standard 6-inch collars, simple air-handler interlock wiring |
| No gravity drain available, tight budget | AlorAir Sentinel HDi90 | Integrated pump removes the drain problem; lowest entry price |
| No ductwork at all, single damp room | Don’t buy whole-house | A 50-pint portable covering 1,000–1,500 sq ft is the honest answer |
Installation, drainage and noise: what the spec sheet doesn’t tell you
- Power: most 70–95 pint whole-house units need a dedicated 115 V, 15 A circuit. Check the nameplate amperage against the circuit’s existing load before assuming you can tap the furnace circuit.
- Drainage, in order of preference: gravity to a floor drain or sump; gravity into a condensate line with a trap; condensate pump to a utility sink or outside. Sharing the AC’s condensate line is common but some local codes restrict it.
- Clearances and filter access: leave room to slide the filter out. A clogged filter raises discharge temperature and shortens compressor life more than anything else you control.
- Noise: whole-house units generally land in the 48–60 dBA range at a few feet, which is louder than a modern refrigerator but far quieter than a portable in the same room — and ducting moves the sound source out of living space entirely.
- Cold-weather behavior: below roughly 60°F, expect reduced output and possible coil frost. If your basement sits at 55°F in winter, you want a unit rated for low-temperature operation rather than the cheapest 90-pint box.
Frequently Asked Questions
How many pints per day do I need for a 2,500 sq ft house?
As a rough screen, plan on 60–100 pints per day for 2,500 sq ft in a humid climate, which puts you in the 95-pint class such as the Aprilaire 1850 or Honeywell TrueDRY DR90. If the house is tight, well insulated and has a sealed crawlspace, the low end is fine; if it is leaky, has a vented crawlspace or sits in a coastal climate, size up. A contractor’s moisture load calculation is the only way to be precise.
Do I still need one if I have air conditioning?
Often yes, but not always. AC removes moisture as a side effect of cooling, and a correctly sized system running long cycles will hold indoor humidity near 50% in most homes. The problem is oversizing: a system that satisfies the thermostat in ten minutes never runs long enough to dehumidify, which is why so many homes feel clammy at 72°F. If your indoor RH sits above 55% with the AC running normally, a dedicated dehumidifier is the fix.
Can a whole-house dehumidifier work without ductwork?
Yes, with limits. Units like the Santa Fe Ultra98 can run free-standing in a basement or crawlspace, dehumidifying that space directly. Others can be ducted to a single supply register so they condition one zone. What they cannot do is treat a closed-off second floor through a closed door — for that you need ducting into the return, or a portable unit in that area.
Is a whole-house unit actually cheaper to run than portables?
Per pint of water removed, usually yes. A ducted 95-pint unit at roughly 860 W removes about 4.6 pints per kWh at rated conditions, and it does so in one compressor instead of two or three. Portables also lose a meaningful share of rated capacity as room temperature falls, so the gap widens in basements. The honest caveat: a whole-house unit only wins if the house actually needs that capacity.
Where does all the water go?
Condensate is collected at the coil and routed out. At 70 pints per day that is about 8.75 gallons daily, or 0.36 gallons per hour — small enough for a 3/8-inch line with a 1/4-inch-per-foot slope to a floor drain or sump. Where gravity isn’t available, a condensate pump moves it up and over to a sink, laundry drain or outside. The pump is the most common failure point, so keep the discharge line clear and check it seasonally.
How loud is a whole-house dehumidifier, really?
Expect roughly 48–60 dBA at a few feet from the cabinet, depending on model and whether the compressor is running. In a ducted install the sound source is in the basement, attic or utility closet, so what you hear at the register is mostly air noise. A portable 50-pint unit in a living room typically measures in the same range but sits right where you are.
