Who changes the furnace filter in a rental, landlord or tenant?

In most rentals, the landlord is responsible for the furnace filter unless the lease clearly says the tenant is. Even then, the landlord still owns the furnace and the repair bill when a clogged filter wrecks it. The only setup that works in practice is one where the lease assigns the job, the landlord supplies the filters, and someone reminds the tenant when it is time.

This guide covers what the law says, what to put in the lease, and how landlords with a handful of units handle it without driving across town every three months.

What the law says

Landlord-tenant law in every state requires the landlord to keep the rental fit to live in and in reasonable repair, and that includes the heating system. Routine upkeep like filter changes is usually not spelled out, which is why it ends up in the lease.

Minnesota is a good example. Minnesota Statute 504B.161 requires every residential landlord to keep the premises fit for use, in reasonable repair, and supplied with heat of at least 68°F from October through April. Those duties cannot be waived. The same statute does allow a landlord and tenant to agree that the tenant will perform specified maintenance, but only if the agreement is in a conspicuous writing and supported by adequate consideration.

For a furnace filter, that means two things:

  1. You can assign filter changes to the tenant, but it has to be in writing and stand out, not buried in a paragraph about lawn care.
  2. The tenant has to get something for it. Supplying the filters for free is the easiest way to cover that, and it is also the only way the job gets done.

Other states have similar rules. Most let the lease assign routine maintenance to the tenant, and most still hold the landlord responsible for the furnace itself. If your rental is outside Minnesota, check your state's landlord-tenant statute or ask a local attorney, because a few states and cities limit what you can shift to a tenant.

This article is general information, not legal advice. Have a local attorney review your lease.

Why it matters more than it sounds

A furnace filter costs a few dollars. A furnace does not.

  • A clogged filter makes the blower work harder, which is the leading cause of early blower motor failure. A replacement motor runs several hundred dollars installed.
  • Restricted airflow can overheat the heat exchanger. Cracked heat exchangers are a safety issue and often mean a new furnace.
  • In summer, the same clogged filter can freeze the AC evaporator coil, which means a service call and a tenant with no cooling.
  • Dirty filters raise heating and cooling bills by a noticeable amount, and if you pay utilities that comes out of your rent.

Landlords lose this argument the same way every time: the lease said the tenant would change the filter, the tenant never did, and the landlord is still the one paying for the furnace repair. A lease clause is not a maintenance plan. Here's what happens when tenants never change the filter, and the warning signs to watch for.

What to put in the lease

A workable filter clause does four things:

  1. Names the job. "Tenant will replace the furnace filter every [60/90] days and whenever the landlord or a reminder notifies them."
  2. Supplies the filters. "Landlord provides filters at no cost to the tenant." This covers the consideration requirement and removes the excuse.
  3. Sets the consequence. "If the filter is found dirty or missing at an inspection, landlord may replace it and charge a $[25] service fee." Keep it modest and reasonable.
  4. Keeps the furnace with the landlord. "Landlord remains responsible for repair of the heating and cooling system except for damage caused by tenant neglect."

Put it in its own addendum rather than in the body of the lease. That satisfies the "conspicuous" requirement, and it means you can add it to existing tenants at renewal without rewriting the whole lease.

Download the free tenant air filter lease addendum. It is written for Minnesota and works as a template for other states. To see whether your state lets you shift filter changes to the tenant, check furnace filter responsibility by state.

What actually gets filters changed

The lease assigns the job. These are the things that make it happen:

  • Filters on site. Leave a year's supply next to the furnace, labeled with the size. If the tenant has to buy a filter, they will not.
  • A reminder. Nobody remembers a 90-day task. A text to the tenant with a photo of where the filter goes gets a far better response than a line in the lease.
  • An inspection point. Check the filter at every walk-through and any time you are on site. It takes ten seconds and tells you whether the tenant is doing anything else they agreed to.
  • The right filter. For most rentals, a MERV 8 pleated filter is the right balance of air cleaning and airflow. Go to MERV 11 for tenants with pets or allergies. Skip higher ratings in 1-inch slots; they restrict airflow on older furnaces.

If you own a few rentals, this is the part that stops scaling. Twelve units on a 90-day schedule is 48 filter changes a year to remember, buy for, and chase. That is what Filterflow is built for: a year of filters in the right size shipped to the property, free FedEx shipping, and a text to the tenant every time a change is due. You set it up once per unit. See how it works.

Quick answers

Can a landlord require the tenant to change the furnace filter? Yes, in most states, if the lease says so in writing. In Minnesota the agreement must be conspicuous and supported by consideration, so supply the filters.

Can a landlord charge a tenant for furnace damage caused by a dirty filter? Often, if the lease assigned the job and you can show the filter was neglected. It is hard to prove and rarely covers the full repair. Preventing it is cheaper than litigating it. What you need to prove, and how much you can recover.

How often should a furnace filter be changed in a rental? Every 90 days for a standard 1-inch pleated filter, every 60 days with pets, and every 6 to 12 months for 4-inch and 5-inch media filters. Check it monthly during the first winter to learn the house. See the full schedule by filter depth, pets and season.

Who pays for the filters? The landlord should. Filters are cheap, the furnace is not, and in Minnesota supplying them helps satisfy the consideration requirement.

Does the tenant have to change the filter if the lease does not mention it? Generally no. Without a written agreement, routine maintenance stays with the landlord.

About the author. Wyatt D. has owned and managed rental homes in the Twin Cities west metro and Fargo, North Dakota, since 2010, and now has 10. He started Filterflow after tenants who skipped filter changes cost him two to three furnace repairs in a single year.

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