A broken furnace in January or a dead AC unit in August — these are the calls that ruin your weekend and drain your bank account. But most expensive HVAC repairs don’t come out of nowhere. They come from skipped maintenance, unclear responsibilities, and tenants who assume you’re handling everything (while you assume they’re handling the basics).
Here’s a practical breakdown of what landlords are actually responsible for with HVAC systems, what you can reasonably expect from tenants, and how to keep the whole system running without surprises.
Your Legal Obligations as a Landlord
In nearly every state, landlords are required to provide habitable living conditions. That includes functioning heating. Many jurisdictions also include cooling, especially in southern states where extreme heat poses a health risk.
At a minimum, you’re responsible for:
- Providing a working heating system at move-in (and maintaining it throughout the lease)
- Repairing or replacing HVAC equipment when it fails due to age, normal wear, or mechanical breakdown
- Ensuring the system meets local building and safety codes — this includes proper venting for gas furnaces and functioning carbon monoxide detectors where required
- Responding to HVAC emergencies in a reasonable timeframe — a furnace failure in winter is not a “we’ll get to it Monday” situation
If the unit came with central air or a provided window unit, you’re generally on the hook for maintaining that too. If the tenant installs their own window unit, that’s typically their responsibility — but spell it out in your lease regardless.
What You Can Expect Tenants to Handle
You shouldn’t expect tenants to service the HVAC system, but you can and should expect them to handle basic upkeep that prevents damage. The key is putting it in writing.
Reasonable tenant responsibilities include:
- Replacing air filters on a regular schedule (every 1–3 months depending on the filter type)
- Keeping vents and registers unblocked — no furniture shoved against return air vents
- Not tampering with the thermostat wiring or the unit itself
- Reporting problems promptly before a small issue becomes a big one
- Keeping the area around outdoor condenser units clear of debris, trash, and overgrown plants
The filter issue is the big one. A clogged filter forces the system to work harder, drives up energy costs, and can lead to frozen coils or compressor failure. Some landlords provide filters to tenants quarterly to remove any excuse. Others do the filter changes themselves during routine inspections. Either approach works — just don’t leave it ambiguous.
Seasonal Maintenance You Should Be Doing
Twice-a-year professional HVAC maintenance is the standard recommendation, and it’s worth every dollar. Schedule a tune-up in the spring for cooling and in the fall for heating. A typical service visit runs $75–$150 per unit and covers:
- Inspecting and cleaning coils
- Checking refrigerant levels
- Testing electrical connections and thermostat calibration
- Lubricating moving parts
- Inspecting the condensate drain line
- Checking the heat exchanger for cracks (critical safety issue for gas furnaces)
This isn’t optional maintenance — it’s how you avoid the $4,000 compressor replacement or the emergency weekend call from an HVAC tech charging double rates. Proactive maintenance extends equipment life by years and keeps tenants comfortable enough to renew their lease.
A Note on Equipment Age
Most HVAC systems last 15–20 years with proper maintenance. If your units have systems older than 12–15 years, start budgeting for replacement. Waiting until a system dies completely usually means you’re paying rush pricing and making a pressured decision on equipment selection.
Put It in the Lease
Ambiguity about HVAC responsibilities is where disputes start. Your lease should clearly state:
- Who is responsible for filter changes (and how often)
- That tenants must report HVAC issues within a specific timeframe
- That tenants should not attempt their own repairs on the system
- What temperature range the thermostat should stay within to prevent frozen pipes or system strain (typically no lower than 55°F in winter)
- Whether the tenant or landlord is responsible for the electric/gas bill (this affects how they use the system)
If a tenant’s negligence causes HVAC damage — like never changing a filter for a year, leading to compressor failure — a clear lease gives you ground to recover costs from the security deposit.
Track Everything
Keep records of every HVAC service call, filter delivery, inspection, and tenant complaint. When a system fails and you need to determine whether it was wear and tear or tenant negligence, documentation is the only thing that matters. It also helps at tax time — HVAC maintenance is a deductible expense, and replacements can be depreciated.
Tracking maintenance across multiple units gets messy fast with spreadsheets and email threads. That’s where having a system matters more than which system you use — just make sure every service call, receipt, and communication is logged somewhere accessible.
HVAC maintenance isn’t glamorous, but it’s one of the highest-ROI habits a landlord can build. A well-maintained system keeps tenants happy, avoids emergency spending, and protects the value of your property. Get your responsibilities in writing, stay ahead of the maintenance schedule, and track everything. If you need a simple way to manage maintenance records and expenses across your properties, create a free DoorLedgers account and keep it all in one place.