Santa Fe vs AprilAire crawl space dehumidifiers

Quick verdict

These are the two crawl space dehumidifiers we find already installed under houses more than any others, and they are closer than the forum arguments suggest. Both are rated at the AHAM 80°F/60% condition (70 pints a day for the Compact70, 80 for the E080), both publish their efficiency honestly at two conditions, both have a cold-air floor of 49 to 50°F, both drain by gravity out of the box with a pump as an extra purchase, and both carry warranties that embarrass the 1-year retail portables.

Buy the Santa Fe Compact70 if the crawl space is low. At 12 in. tall and 55 lb it goes through a 16-by-24 hatch and sits under joists where the 15-in. E080 does not fit with a pad and a drain fitting under it. You also get a MERV-13 filter as standard, a 6-year warranty, and Santa Fe's coverage figures bracketed by sealing level (2,600 sq ft tightly sealed, 2,200 moderate, 1,800 loose), which are the most honest in the category.

Buy the AprilAire E080 if you have 20 in. of clearance and you intend to duct the unit or run a wall control. The 10-in. inlet and outlet collars are part of the unit, the blower holds 135 CFM against 0.2 in. w.c. of static, the Model 76 wall control puts the humidistat in the hallway, it is quieter when ducted (45 dBA), more efficient (2.8 L/kWh against 2.6), built in the USA, and recognized as ENERGY STAR Most Efficient 2025. Accept a 5-year warranty instead of 6 and a MERV 8 filter.

If the crawl space is cold and leaky, neither is the right answer; the AlorAir Sentinel HDi90 in our crawl space roundup is rated to 33.8°F. Seal the space first regardless.

Capacity and what the numbers mean

Santa Fe rates the Compact70 at 70 pints a day at 80°F and 60 percent RH. AprilAire rates the E080 at 80 pints at the same condition and 65 pints at 73°F/60%, the DOE whole-home test point. Santa Fe does not publish a 73°F figure for the Compact70, but it publishes something more useful for a crawl space: efficiency at 65°F/60%, where the 2.6 L/kWh headline falls to 1.96. AprilAire's drop is from 2.8 at 80°F to 2.35 at 73°F. Read across those pairs and the picture is consistent: at crawl space temperatures both units pull roughly 70 percent of their rated water, and the AprilAire pulls about 10 to 15 percent more of it per kilowatt-hour.

Ten pints a day is a real difference at the margin. A 2,200 sq ft moderately sealed crawl space is the top of the Compact70's range and comfortably inside the E080's. Below about 1,800 sq ft of sealed crawl space, the extra capacity buys nothing but shorter run cycles; above it, the E080 is the safer size, or you step up to the E100 and Ultra98 covered below. Run your own numbers in the sizing calculator with 25 percent headroom.

About coverage: Santa Fe's three-tier figures assume a crawl space; AprilAire's 'up to 4,400 sq ft' is a whole-house number for a sealed, conditioned structure and should not be applied to a crawl space at all. The tier system is a reason to trust Santa Fe's sizing advice; it is not evidence the Compact70 is the larger machine.

Height, weight and getting it in

This is the deciding spec for most crawl spaces. The Compact70 is 12 in. wide, 12 in. tall and 21 in. deep at 55 lb. The E080 is 14 in. wide, 15 in. tall and 26 in. long at 63 lb. Three inches of height and 5 in. of length do not sound like much until you are on your stomach under 18-in. joists trying to get a unit, a paver and a drain fitting under them, or turning it through a hatch that was framed for a person, not a box.

Our rule from installs: measure the lowest clearance between grade and the bottom of the joists along the whole path from the hatch to the spot, subtract 3 in. for the vapor barrier, pad and fitting, and if the answer is under 18 in., the Compact70 is the only one of the two that goes in without excavating. Over 20 in., both fit, and either can be hung from the joists on straps to keep it out of any water. Both are a one-person carry on flat ground and a two-person job through a hatch.

Airflow and ducting

The E080 is built to be ducted; the Compact70 can be. AprilAire publishes a static-pressure curve (185 CFM free-air, 135 at 0.2 in. w.c., 85 at 0.4) and ships the unit with 10-in. inlet and outlet collars, so a divided crawl space or a tie-in to the house return is a parts-store run. Santa Fe publishes 150 CFM at zero static for the Compact70 and sells the duct kit separately; the exhaust rotates so you can aim it down the long axis without ducting at all.

If the crawl space is one open rectangle, neither needs duct and the airflow difference is minor. If it is divided by footing walls, wraps around an addition, or has a dead end behind the HVAC plenum, the E080 with a short duct run to the far end is the cleaner install. If you want to pull air from the far end and push it through more than about 25 ft of duct, both are undersized for the job; that is Ultra98 territory.

Filters

Santa Fe ships the Compact70 with a MERV-13 filter (part 4037724) plus a washable pre-filter. AprilAire ships the E080 with a washable MERV 8 (part 5881). MERV-13 catches fine dust and mold spores and matters when the dehumidifier also serves living space through a duct; it also loads faster, so plan on checking it every three months under a house. MERV 8 is a dust filter you rinse in the laundry sink. For a plain crawl space either is adequate; for a ducted install that feeds the house, the Santa Fe filter is the better spec, and it is the one cell in the table where the cheaper unit wins outright.

Controls and monitoring

The Compact70 has onboard controls only; Santa Fe lists no remote or wall control option for it. The E080 has an onboard digital display and takes AprilAire's optional Model 76 wall control, which puts the humidistat and the readout upstairs. If you have ever crawled 40 ft on a vapor barrier to read a display, you understand why this matters. The workaround for the Santa Fe is a Wi-Fi hygrometer parked in the far corner, which you should do with either unit; a wall control tells you the setpoint, a far-corner sensor tells you the truth.

Cold-weather floor

Santa Fe rates the Compact70 for 49°F to 95°F inlet air. AprilAire rates the E080 for dehumidification from 50°F to 104°F with a 40°F dew point minimum. Call that identical. In a sealed crawl space in most of the country the floor rarely bites, because a crawl space under 50°F is not producing much moisture; in a cold, vented or partly sealed space, both will spend the shoulder seasons cycling off on defrost. Neither is the unit for that job.

Drainage and pumps

Neither ships with a pump or a hose. The Compact70 has a drain fitting for a hose; Santa Fe sells a pump kit rated to 12 ft of lift. The E080 has a 3/4-in. MNPT drain with a barbed fitting in the box and takes any standard condensate pump. Both want a hose with continuous fall to a floor drain, sump or daylight, hung from the joists so it cannot belly on the vapor barrier, and a pan with a water alarm under the unit; our continuous-drain guide covers the hose, the pump and the float safety.

Electrical

Both draw about 5 A running on 115 V: Santa Fe lists 3.7 A at 65°F/60% and 5.1 A at 80°F/60% (580 W) for the Compact70; AprilAire lists 5.1 A for the E080. Either goes on a 15-A GFCI-protected crawl space circuit with room for a condensate pump, and neither should share a circuit with the sump pump. AprilAire also sells the E080H hardwired version; Santa Fe's Compact70 is cord-and-plug.

Sound

Santa Fe publishes 55 dBA for the Compact70. AprilAire publishes 45 dBA for the E080 when ducted; it does not publish a free-air figure, and a ducted unit is always quieter at the register than the same unit sitting in the open. Under a house, sound matters only if the unit sits beneath a bedroom; if it does, the E080 ducted is the quieter choice, and either unit on a rubber pad rather than directly on a paver is quieter than the same unit without one.

Warranty and support

Santa Fe: 6 years on the current Compact70 (part 4044110). AprilAire: 5 years on the E080, built in the USA. Both are long enough to cover a compressor failure, which is the expensive one, and both companies sell parts and filters directly. We weight warranty at 15 percent of the score in this class because these units run for months at a time for a decade; the extra year is why the Santa Fe scores higher on that line.

The bigger pair: Ultra98 vs E100

If the crawl space is over roughly 2,500 sq ft, divided, or shares the unit with a basement, the comparison moves up a size. The Santa Fe Ultra98 is the ducted whole-house unit: 100 pints a day at 80°F/60% and 71.4 at 73°F/60%, about 2.9 L/kWh, 320 CFM free-air and 215 at 0.4 in. w.c., a 17.5-by-14-in. MERV-13 filter, 47.5 dBA and a 6-year warranty, in a 19.5-in.-tall, 81-lb cabinet that requires an external control (Santa Fe's DEH3000 or a Honeywell HumidiPro). The AprilAire E100 is the E080's cabinet with a bigger blower: 100 pints at 80°F/60% and 85 at 73°F/60%, 2.6 L/kWh, 280 CFM free-air and 210 at 0.4 in. w.c., 6.9 A, 64 lb, 15 in. tall, MERV 8, 55 dBA ducted, 5-year warranty, built in the USA, ENERGY STAR Most Efficient 2025.

The E100 fits anywhere the E080 fits and is the pick when height still matters at this size. The Ultra98 wins on efficiency, filtration and sound, and it is the one to buy when the unit will live in a mechanical room and serve the whole house through real duct runs; it is more machine than a crawl space alone needs.

Recommendation

Measure first. If the clearance along the path from the hatch is under 18 in., buy the Compact70 and stop reading; nothing from AprilAire fits. If you have 20 in. or more and a simple open crawl space with a downhill drain, either works, and we lean Compact70 for the MERV-13 filter, the extra warranty year and the honest sizing tiers. If you have the clearance and the crawl space is divided, long, or you want the humidistat on a wall upstairs, buy the E080 and duct it. Over about 2,500 sq ft or with a basement in the mix, step up to the E100 for a low crawl space or the Ultra98 for a ducted whole-house install.

Whichever you choose, the sequence is the same: fix bulk water, encapsulate, seal the vents, then dehumidify. Our crawl space roundup covers the sealing work and the AlorAir alternative for cold spaces; if you would rather have the encapsulation and the install done for you, use the quote form below.