Schedule boiler or furnace service before January so the visit happens in November or December 2026, on a regular rate, with parts still on the truck. January 2027 is mid-heating season in much of the United States and Canada. It is a bad month to discover you are on a two-week wait list. Book the service, get into the units, and write down what the technician found before a no-heat call spends the same money at after-hours rates.

This is a maintenance routine, not legal advice. Entry notice and minimum heat are local. In New York, for example, heat season runs from October 1 through May 31, so January is not the start of the obligation and not the end of it. Between 6 a.m. and 10 p.m., when it is below 55 degrees Fahrenheit outside, indoor heat must be at least 68. Overnight the minimum is 62. That is NYC Housing Preservation and Development's rule, not a national one. Your city may differ. ENERGY STAR still recommends a yearly tune-up, a filter check every month in heavy heating months, and a filter change at least every three months. The American Red Cross adds a cold-weather note that belongs in the same visit: keep the thermostat steady day and night in a hard freeze, instead of a deep setback that lets pipes cool.

A wall-mounted boiler with its cabinet open, showing pipes and valves in a kitchen.
Image: Turbojet · CC BY-SA 4.0

When should the tune-up be on the calendar?

Put the appointment on the books in early November 2026, for a date before the last week of December. The goal is a completed visit, not a promise. Vendors fill January with no-heat calls. A tune-up that "slides into January" often becomes a tune-up that never happens, or happens at an emergency rate after something fails.

Tell the owner the date range and the not-to-exceed amount before you confirm the vendor. "Boiler service at 19 Harbor during the week of December 8, not to exceed $500, filters included" is an instruction. "We will get the heat looked at sometime" is not. If they want a cheaper vendor, that choice has to land while there is still a calendar slot. Waiting until January 6 to comparison-shop is how you enter the coldest weeks with no one on contract.

Write the appointment on the work order the day you book it, with the vendor's name and the access plan. A date that lives only in your inbox will be double-booked.

What should the service visit include?

Ask for a written list before the truck rolls, and match the invoice to that list. For a forced-air furnace, a useful visit includes a safety check of the heat exchanger or the technician's statement that they could not fully inspect it, a test of ignition and the blower, a look at the flue, the filter changed, and the thermostat confirmed in heat. For a boiler, it includes pressure and temperature observed, the circulator listened to, visible leaks noted, the relief valve not forced if the vendor says forcing it on an old valve can make it stick, combustion checked where the equipment allows, and the zone or outdoor reset left at a setpoint you recorded.

ENERGY STAR's filter rule is the part you can do even if the technician is late. Check filters monthly in December and January, and do not let a tune-up be the only time anyone looks. A packed filter is a reason a January night becomes a no-heat call. Change it at least every three months, and sooner if the November check was already gray.

You want findings, not a sticker. The work order should say "heat exchanger visual, no crack noted" or "could not inspect, camera recommended," plus any part the technician says will fail soon. A sticker with a smiley face and no sentence is not a record you can show an owner after a breakdown.

Do not accept a tune-up invoice that is only a filter and a date. If that is all they did, the description on the bill should say so, and the price should match a filter visit. Paying tune-up rates for a filter change is how owners lose trust in the December statement.

How do you get into occupied units in December?

Give the notice the lease and the local rule require, and offer two times inside the service week. December travel and holiday shifts make single-slot notices fail. A tenant who can pick Tuesday morning or Thursday afternoon will usually pick one. A tenant who is given one hour on December 23 will often refuse.

If they refuse both, document the refusal, tell the owner, and do not skip the system that you can reach without that unit. A building boiler in a basement may not need every apartment. A furnace in a closet does. Say which situation you have. Do not enter without the notice because the vendor is idling at the curb. A tune-up is not an emergency entry.

For vacant units, go. There is no holiday conflict. Those furnaces are the ones that freeze a house quietly. Set the thermostat where the owner agreed, steady through the cold nights, consistent with the Red Cross guidance on avoiding a deep setback when pipes are at risk. Record the setpoint you left.

If a carbon monoxide alarm sounds while the technician is working, stop the visit, get people out, and treat it as a real alarm rather than a byproduct of testing. Do not finish the tune-up and mention the alarm in a footnote.

How do you compare a tune-up quote to a replacement quote?

A tune-up quote is a visit with a cap. A replacement quote is a new heating plant, a different approval, and usually a different year of budgeting. Keep them in separate documents. Technicians often deliver both on the same afternoon, because they found a failing part. That is useful. It is not permission to replace the boiler.

Read the tune-up findings first. A flame sensor, an ignitor, or a circulator capacitor is a repair with a price you can take back to the owner the same day. A cracked heat exchanger or a boiler that no longer holds pressure is a safety and replacement conversation, and the tune-up invoice should stop at the inspection unless the owner has already authorized a repair. Do not let "we should replace it" ride along as labor hours on the service invoice.

When you forward a replacement quote, include the finding, the age of the equipment, and the exclusions. Same venting, same removal, same permit assumption. A low number that excludes hauling the old boiler is not lower. Do not promise the new equipment will pay for itself. ENERGY STAR's note that heating and cooling are a large share of home energy use is not a savings guarantee for 19 Harbor.

What does a six-unit heating visit cost?

Luis Ortega owns 19 Harbor, six apartments on one boiler plus a common filter at the air handler that serves the halls. On November 3, 2026 he approves service not to exceed $500.00, scheduled for December 9. His available trust balance is $3,400.00. The visit happens on December 9. The boiler service is $385.00. Six furnace-style filters are not the right part here. The hall air handler takes one filter at $18.00, and the boiler visit includes combustion check and a circulator inspection. No safety failure. The technician flags a noisy circulator and prices a replacement at $240.00, not done.

Line What happened on December 9 Amount Against the $500 cap
Boiler service, Harbor Mechanical invoice 118 Combustion, pressure, circulator inspection, no leak found $385.00 $385.00 used
Hall air-handler filter Changed during the same trip, on invoice 118 $18.00 $403.00 used
Circulator replacement Quoted, not approved, not performed $240.00 not counted
Total paid Invoice 118 $403.00 $97.00 of cap left

Check it. $385.00 plus $18.00 is $403.00. The cap was $500.00, so $97.00 remains, which is not enough for the $240.00 circulator. You do not stretch the cap because the technician is in the basement. You pay invoice 118 at $403.00 from Luis's trust balance. $3,400.00 minus $403.00 is $2,997.00 available after the payment, before fees and other December bills. You send the $240.00 circulator quote the same day and wait.

If he replies "do the circulator, up to $240," that is a new line and a new not-to-exceed. It can be the same vendor on a return visit. It is not a quiet edit to invoice 118 after you already described $403.00 to him. A revised invoice must be a revised total you both can see. $403.00 plus $240.00 is $643.00, which is a different approval from the original $500.00. Say the new total in the email before the part is installed.

Do not add a trip charge you did not warn him about. If the return visit has a $75.00 trip fee, the email says $240.00 plus $75.00, total $315.00, not "about $240." $240.00 plus $75.00 is $315.00. Owners approve the email they actually received.

What do you do with a unit or a boiler that fails the visit?

If the December 9 visit finds a crack, a flue that spills, or a boiler that will not hold safe pressure, the tune-up becomes an emergency work order before the technician leaves the mechanical room. You call Luis with the finding and the make-safe options while the facts are fresh. Shutting the boiler down may be the safe step. If you shut it down, you also start the no-heat plan for six apartments: temporary heat that is listed and electric, or another unit, or a hotel cap he approves. You do not run a boiler the technician just failed because the weekend is coming.

Write the failure on the work order in the technician's words, plus the time and whether the equipment was left on or off. Pay the inspection portion they completed. Do not pay a "tune-up complete" line if they aborted for safety. The invoice should say "inspection, unsafe condition found, equipment disabled" or it is the wrong invoice.

Schedule the follow-up before January if a repair can put the boiler back the same week. If the fix is a replacement that will not arrive until January 2027, the owner note says that date and the interim heat plan. The interim plan has a daily or nightly cost so Luis sees the burn rate. A $90 hotel night is $630 a week. Say it before the seventh night, not after.

A failed boiler at 19 Harbor does not cancel the furnace service you owe at the next address. Keep that appointment. The failure is a project. The rest of the list is still prevention.

Book the service before January, pay the invoice that matches the visit, and send any replacement quote as its own decision. The owner statement for December should show invoice 118 at $403.00 and silence where the $240 circulator was not approved. Close the tune-up as a work order in Tivio with invoice 118 attached, so January's statement shows a bill the owner already expects.