Range hoods can work without venting outside, but ducted hoods that vent outdoors remove more heat and cooking odors

A range hood does not have to vent outside. You have two main options: ducted hoods that push air through a duct to the outdoors, and ductless hoods (also called recirculating hoods) that filter the air and push it back into your kitchen. Which one works better depends on your kitchen layout, your budget, and how much cooking you do.

Ducted hoods are more effective at removing heat, moisture, and odors because they send the air outside entirely. Ductless hoods are cheaper to install, require no ductwork, and work in any kitchen — but they filter and recirculate the same air, so they do not remove humidity as well. Neither choice is wrong; it depends on what matters most to you.

Key Takeaways

  • Ducted range hoods vent air outside and remove more heat and moisture, but they require ductwork that can be expensive to install in existing kitchens.
  • Ductless range hoods filter air and push it back into the kitchen, cost less to install, and work anywhere — but they do not remove humidity or heat as effectively.
  • Building codes in most areas do not require a range hood at all, though some jurisdictions mandate one for commercial kitchens or new construction.
  • A ducted hood pulls air out of your home, which can create negative pressure and pull cold air in from outside during winter if your kitchen is not well-sealed.
  • Ductless hoods need filter replacements every few months depending on cooking frequency, while ducted hoods need occasional duct cleaning.

How ducted hoods remove air from your kitchen

A ducted range hood uses a fan to pull steam, smoke, and odors up through a metal duct that runs to the outside of your home. The duct typically exits through the roof, a side wall, or sometimes through a soffit. The fan pushes all that air out, so nothing comes back into your kitchen.

This is the most effective way to remove heat and moisture. If you cook frequently or cook foods that produce a lot of steam (like boiling pasta or steaming vegetables), a ducted hood will keep your kitchen cooler and drier. It also removes odors completely instead of just filtering them. The downside is installation: running ductwork through walls, ceilings, or attics costs money, and if your kitchen is far from an outside wall, the duct run becomes longer and more expensive.

Ducted hoods also create what builders call negative pressure. When the fan pulls air out, it can create a slight vacuum in your kitchen. In winter, this can pull cold air in through cracks around windows and doors, or through your fireplace if you have one. In homes with tight sealing, this is usually not noticeable. In older or drafty homes, you might feel it.

How ductless hoods filter and recirculate air

A ductless range hood has a fan and one or more filters — usually a metal mesh filter to catch grease, and a charcoal filter to absorb odors. The fan pulls air through these filters and pushes it back out into your kitchen. No duct, no outside connection, no installation headaches.

Ductless hoods are cheaper to buy and much cheaper to install because you do not need ductwork. You can add one to any kitchen, even a rental apartment, because it just needs a power outlet and mounting space above the stove. They work when ready and do not create negative pressure.

The trade-off is that they do not remove heat or moisture — they just filter the air and send it back. If you boil water or steam food regularly, the humidity stays in your kitchen. The charcoal filter also wears out and needs replacement every three to six months depending on how much you cook. If you ignore the filter, odors come back and the hood becomes less effective.

Building codes and whether you need a range hood at all

Most residential building codes do not require a range hood above your stove. You can legally install a stove without one. However, some jurisdictions do require a hood in new construction or major kitchen renovations, so check your local building department before you plan a remodel.

Commercial kitchens almost always require a hood, and it must be ducted. Restaurants, food trucks, and catering kitchens all need to vent cooking fumes outside. Residential kitchens have much looser rules.

If you rent, your lease might require a hood or might not. Check your lease or ask your landlord before removing one or deciding not to install one. Some landlords care about cooking odors affecting other units; others do not.

Comparing installation cost and complexity

A ductless hood costs between $200 and $800 to buy, depending on size and brand. Installation is usually just mounting it to the wall or cabinet above your stove and plugging it in. You can do this yourself in an hour if you are comfortable with a drill and level.

A ducted hood costs $300 to $1,500 to buy, but installation is where the real expense appears. If your kitchen is already set up for a ducted hood (meaning there is already a duct in place), installation might be $200 to $500. If you need to run new ductwork, expect $500 to $2,000 or more depending on how far the duct has to travel and whether it goes through walls, ceilings, or the attic. Running a duct through an exterior wall is cheaper than running it through the roof, which requires cutting and sealing.

In a kitchen remodel where walls are already open, running ductwork is much cheaper than doing it in an existing finished kitchen. If you are not remodeling, a ductless hood is usually the more practical choice unless you are willing to pay for the ductwork.

Maintenance and filter replacement

Ductless hoods require regular filter changes. The metal mesh grease filter can usually be washed in the dishwasher or by hand, so it does not need replacement — just cleaning every month or two depending on cooking frequency. The charcoal filter cannot be cleaned and must be replaced every three to six months. If you cook daily, plan on replacing it four times a year. If you cook a few times a week, twice a year might be enough.

Ducted hoods do not have charcoal filters, so there is no recurring filter cost. However, the ductwork can accumulate grease buildup over time, especially if you cook a lot of fried foods. You should have the duct cleaned every one to three years depending on use. A professional duct cleaning costs $200 to $500. You can also clean accessible ducts yourself with a brush and some effort.

Both types of hoods have a metal grease filter that needs cleaning. On a ducted hood, this filter just catches the largest particles before air enters the duct. On a ductless hood, the grease filter is the first stage of a two-stage system, so keeping it clean is more important for the charcoal filter to work well.

Which type makes sense for your kitchen

Choose a ducted hood if you cook frequently, cook foods that produce a lot of steam, or want the most effective odor and heat removal. You should also choose ducted if you are already doing a kitchen remodel and ductwork can be run while walls are open. The upfront cost is higher, but you get better performance and no recurring filter costs.

Choose a ductless hood if you rent, if your kitchen is far from an outside wall, if you cook infrequently, or if you want to avoid the installation cost and complexity. You will need to replace the charcoal filter regularly, but the hood will still work and is much easier to install.

Some people choose a ductless hood as a temporary solution and upgrade to ducted later if they remodel. Others use a ductless hood for years and never feel the need to change. There is no single right answer — it depends on your situation and what you are willing to spend.

Frequently Asked Questions

Can I vent a range hood into my attic instead of outside?

No. Venting into an attic pushes hot, moist air into a space that is not designed for it. This causes moisture buildup, which leads to mold, rot, and damage to insulation and framing. Always vent to the outdoors or use a ductless hood instead.

What if I do not have a wall or roof space to run a duct?

A ductless hood is your best option. If you really want a ducted hood, you could run the duct through a window using a special insert, but this is awkward and not common. Most people in this situation choose ductless.

Do I need a makeup air system if I install a ducted hood?

Not in most homes. A makeup air system brings fresh air in to replace the air the hood pulls out. It is required by code in some commercial kitchens and in some high-performance homes that are very tightly sealed. In a typical residential kitchen, the small amount of air the hood removes is not noticeable. Ask your local building department if you are unsure.

Can I use a ductless hood in an apartment?

Yes. Ductless hoods are ideal for apartments because they do not require any ductwork or modifications to the building. Check your lease to see if there are any restrictions, but most landlords allow them since they are temporary and removable.

How often should I replace the charcoal filter in a ductless hood?

Every three to six months if you cook daily, or every six to twelve months if you cook a few times a week. You will know it is time when odors start coming back even after cleaning the grease filter. Some filters are washable, but most charcoal filters are disposable and cost $15 to $40 each.