Key Takeaways
- Finish by early October. Cincinnati’s first freeze comes around October 25 in a typical year, and by October 12 in 1 year out of 10.
- Every unit gets a heating tune-up, a new filter, and tested CO and smoke alarms. Those three catch the most common winter failures and give you a dated record.
- Shared-boiler buildings carry the most risk. Where tenants don’t control their own heat, Cincinnati requires 70°F inside once it stays below 60°F outside for 24 hours, with fines of $300 for the first day and $750 for each day after.
- Give tenants a one-page winter sheet: who to call, three checks to try first, and what never to use for heat.
A pre-winter HVAC checklist for a rental property comes down to ten things: service the furnace or boiler in every unit, replace the filters, test the carbon monoxide and smoke alarms, check the thermostats, clear the vents, look after any shared boiler, protect vacant units from freezing, check the gas appliances, give tenants written winter instructions, and line up an emergency contractor before you need one. Do it before the first freeze, which in Cincinnati usually arrives in late October. Below is each step, what the law expects in Ohio and Cincinnati, and which items you can handle yourself.
When to Start: Before the First Freeze in Cincinnati
Based on NOAA’s 1991 to 2020 normals for the Cincinnati airport, the first fall freeze comes around October 25 in a typical year. In 1 year out of 10 it comes by October 12, and in 9 years out of 10 it has come by November 5. Heating contractors book up fast after the first cold snap, so schedule rental tune-ups in September and aim to have every unit done by early October.
There is a legal reason to be early too. In Cincinnati buildings where tenants don’t control their own heat, the requirement to keep units at 70°F starts once the outdoor temperature stays below 60°F for 24 consecutive hours. That can happen well before the first freeze.
The Pre-Winter HVAC Checklist for Rentals
1. Book a Heating Tune-Up for Every Unit
Have a licensed technician service every furnace and boiler before heating season. A tune-up catches the weak igniter, dirty flame sensor, and failing inducer motor while they are cheap scheduled repairs, not a 9 p.m. no-heat call. It also tests for carbon monoxide and checks the heat exchanger, which you can’t do yourself. See what’s included in a furnace tune-up. Keep the dated service report for each unit.
2. Replace Filters and Leave Spares
Put a new filter in every unit, write the date on its edge, and leave two or three spares of the right size next to the furnace. Tenants rarely change filters on their own, and a clogged filter is one of the most common reasons a furnace overheats and shuts itself down. If your lease makes filters the tenant’s job, check anyway at the fall visit. Our guide to how often to change a furnace filter covers sizes and schedules.
3. Test Carbon Monoxide and Smoke Alarms
Press the test button on every alarm, replace batteries, and replace any alarm past the replace-by date printed on its back. Every unit with a gas furnace, boiler, water heater, or attached garage should have a working CO alarm near the sleeping areas. Cincinnati requires CO alarms in new residential buildings, and the U.S. Consumer Product Safety Commission recommends one on every level of a home and outside sleeping areas. Check your local code for older buildings, but don’t wait for a code to require something that costs this little.
4. Check Every Thermostat
Replace thermostat batteries, confirm each one switches to heat and calls the furnace, and check that it reads the room temperature correctly. In units where you pay for the heat, a programmable or locking thermostat with a sensible range keeps the heat on without running it at 80°F.
5. Clear Vents, Returns, and Vent Pipes
Walk each unit and make sure registers are open and return grilles aren’t blocked by furniture. Outside, check that the intake and exhaust pipes on high-efficiency furnaces are clear of leaves, nests, and landscaping, and that the flue on older furnaces and water heaters is intact. A blocked vent pipe shuts a furnace down, and a damaged flue can let combustion gases into the unit.
6. Service Shared Boilers
Many older Cincinnati apartment buildings heat every unit from one boiler, which means one failure takes out the whole building. Have it serviced before the season, including the relief valve, low-water cutoff, burner, and combustion test, and bleed air from the radiators so upper-floor units heat evenly. Ohio exempts boilers in houses and buildings with fewer than six units from state inspection, so buildings with six or more units fall under the state’s boiler inspection program. Make sure yours is current. Our guide to annual boiler maintenance covers what the service should include.
7. Protect Vacant Units and Unheated Spaces
A vacant unit with the heat off is a burst pipe waiting to happen. Keep vacant units heated, 55°F is a common minimum, open cabinet doors under sinks on outside walls, and insulate pipes in crawl spaces, garages, and unheated basements. If a unit will sit empty through the winter, consider shutting off and draining the water. See our tips to keep pipes from freezing.
8. Check Gas Appliances and Connections
Have the technician look at gas connections, flexible appliance connectors, and water heater venting during the tune-up. Replace old uncoated brass appliance connectors if you find them. Make sure every tenant knows what a gas leak smells like and to leave the unit and call from outside if they smell one.
9. Give Tenants a One-Page Winter Sheet
Put it on the fridge or send it by text. Include your emergency number and your HVAC contractor’s number, the three checks to try first (thermostat, furnace power switch and breaker, filter), a reminder to keep vents clear, and a plain rule: never heat the unit with the oven, stove, grill, or a generator. The fewer calls that start with "I didn’t know," the better.
10. Line Up Emergency Service and Backup Heat
Decide now who you will call at 9 p.m. on a Saturday in January, and make sure they can get into the building. Keep two or three electric space heaters with tip-over and overheat shutoff on hand for tenants while a part is on order. Our landlord guide for when a tenant has no heat walks through the response step by step.
What Ohio Law Expects From Landlords
We are heating contractors, not lawyers, and this isn’t legal advice. But one statute sets the baseline. Ohio Revised Code 5321.04 requires landlords to keep the heating fixtures and appliances they supply in good and safe working order, and to supply reasonable heat at all times, except where the tenant controls the heat through their own utility connection. A pre-winter inspection with a dated service report is the simplest way to show you met that duty.
Shared-Heat Buildings in Cincinnati
Cincinnati adds a specific rule for units where tenants don’t control their own heat, which usually means buildings on a shared boiler or central system. Once the outdoor temperature stays below 60°F for 24 consecutive hours, the inside has to be kept at 70°F or warmer. Fines run $300 for the first day and $750 for each day after. Our view: for a shared-heat building, a pre-season boiler service is the cheapest insurance you can buy. Three days of no heat costs $1,800 in fines before you have paid for a single part.
Keep a Record for Every Unit
For each unit, keep the date of the tune-up and the technician’s report, the filter size and the date it was changed, the alarm test date, and the model and age of the furnace or boiler. It takes ten minutes per unit, it tells you which systems are nearing the end of their 15 to 20 years, and if a tenant or the Health Department ever questions the heat, it shows exactly what you did and when.
When You Don’t Need a Contractor
A lot of this list is yours to do. Changing filters, testing alarms, replacing thermostat batteries, clearing vents and returns, checking vent pipes outside, winterizing a vacant unit, and writing the tenant sheet don’t need us. What does need a licensed technician is anything inside the furnace or boiler: the burner, heat exchanger, gas connections, combustion and carbon monoxide testing, and boiler safety controls.
Schedule Pre-Winter HVAC Service for Your Cincinnati Rentals
Degree of Comfort services furnaces and boilers in rental homes and apartment buildings across Cincinnati and the surrounding Tri-State, including Northern Kentucky and Southeast Indiana. We can schedule every unit in one visit where access allows, leave a dated report for each system, and flag anything that needs attention before winter. Check our current specials for the furnace tune-up offer, and see our furnace maintenance page for details. We are family-owned, licensed and insured, with upfront, flat-rate pricing and 24/7 no-heat service.
Call (513) 586-5107 to schedule your units, or request an estimate for a multi-unit building.
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