Ventless Dryer Guide

Ventless Dryer Guide

A friendly guide designed to answer the most common questions we get about ventless dryers.


Ventless dryers have been used around the world for over 50 years, but remain somewhat of a mystery to many. This guide answers some common questions about ventless dryers, and shows they are a good decision for many settings. Ventless dryers are convenient and efficient for most residential developments.

Contact us at 1-800-884-8635 or [email protected] to discuss laundry options for your upcoming projects.

Ventless Laundry Basics

Ventless dryers have been extremely popular in Europe and Asia for over 50 years, and are becoming more common in the United States. Ventless dryers remove moisture from air by a form of condensation. Dry air is recycled back into the drum to gather moisture before it is condensed once again. This cycle repeats itself until the laundry is dry.

Two common types of ventless drying systems are Cold Water Condensation Drying and Air-to-Air Condensation Drying.

Venting needed: None

Power requirements: Available in 110V or 220V


  • Ventless dryers offer the performance of traditional laundry without needing external vents or high-capacity plumbing
  • Space and connectivity flexibility make design and construction projects more efficient and profitable
  • With stackable and combo options, even small apartments can be outfitted with in-unit laundry, increasing rents by $50-100 per month per unit
  • Ventless dryers and front-loading washers are highly energy and water-efficient, aligning with green-minded communities. They are often eligible for Department of Energy rebates

Other considerations:

  • Not available with a gas connection
  • Drying times are slightly increased compared to vented dryers
  • Need to have a little space around them to access room air – they can be installed in small areas like closets, but please note that closet doors need to be open while dryer operates
  • Environmental profile: Friendly – ventless dryers are highly efficient because unlike conventional dryers, they recycle the heat they create
Cold Water Condensation Drying

Cold-Water Condensation Drying – All in One / Combo Washer-Dryer

How it works: These machines wash and dry in one machine using cold-water condensation drying. The air inside the machine is heated and circulated through the laundry. After the air is saturated with moisture from the laundry, it is sent through a condensing chamber.

The condensing chamber is kept cool by misting cold water during the dry cycle. Air leaves the chamber dry, and then travels back over the heating element to regain the heat it lost during the cooling process before being sent back into the drum.

This process is repeated until the laundry is dry. The condensed water is collected throughout the process and pumps down the drain using the same hose as the wash water.

Venting needed: None

Power requirements: 110V, 15AMP

Other considerations:

  • This form of drying uses no room air whatsoever – it is 100% self-contained (it could be installed in a box with no make-up air and it would operate perfectly)

  • Requires electricity, hot and cold water, and a drain

Air-to-Air Condensation Drying – Stackable / Stand-Alone Ventless Dryer

How it works: This type of dryer is very popular in stackable or side-by-side washer and ventless dryer applications. The machines use one air circulation system to heat air before sending it through the laundry, and another system to dry and cool the air that has been saturated by the laundry.

After the hot air is sent through the laundry, it cycles through the condenser. At the same time, the dryer cycles room temperature air through the condenser. These air masses do not mix; they simply contrast their temperature on each other through the heat exchanger. When the air cools, moisture condenses and pumps down the drain or into a reservoir, depending on the installation. The cooled air is reheated and sent back through the laundry.

The room temperature air exhausts back into the room slightly warmer than when it entered the dryer, but with no lint or moisture because it did not mix with the hot air. The two air circulation systems continue to cycle until the laundry is dry.

Venting needed: None

Power requirements: 220V, 15Amp

Other considerations:

  • The dryer raises room temperature by 2-5 degrees in the area approximately four feet around the machine

  • The dryer needs space to access room air. It can be installed in enclosed spaces, but the doors must be open during use

Ventless Dryer / Ductless Dryer

Conventional Dryer

How it works: A conventional ducted (vented) dryer is pretty simple. It heats room air and circulates that heated air through wet clothes. That air is then cycled out of the dryer through a duct to the exterior of a building.

Venting needed: Yes, with vent runs limited to 25 feet or less

Power requirements: Most require 240V

Other considerations:

  • Need for venting complicates building design
  • Offering in-unit laundry with conventional dryers leads to massive HVAC costs and makeup air requirements
  • Drying time is shorter compared to ventless dryers
  • Retrofitting an older building with venting (in order to offer in-unit laundry) is often prohibitively expensive
  • Makeup air needed: 10,000 cubic feet per hour
  • Environmental profile: Unfriendly – conventional dryers are highly inefficient and energy-intensive

Choosing the Right Washer-Dryer Pair

  • Washer sizes should be matched with dryer capacity – it’s pointless to have a washer that washes 25 lbs of laundry if your dryer can only handle 16 lbs

    Ventless dryers should be paired with washers that reach spin speeds of 1000-1200+ RPM, because it is important to extract most of the water out of laundry before the drying cycle

    Different brands and dryer types have different electrical and plumbing requirements – take note!


If you have any questions about how ventless dryers work or which appliances would work best for your needs, please feel free to contact one of our appliance experts at 1-800-884-8635.