Fall Is Coming — Is Your Heating System Ready?

September on Long Island can be deceptive. The days are still warm, but nighttime temperatures are already dropping, and before you know it you will be reaching for the thermostat. The worst time to discover your heating system has a problem is the first cold night of the season — when every HVAC company in Suffolk County is flooded with emergency calls.

The smart move is to prepare your heating system in early fall, before you actually need it. Here is exactly what to do.

1. Schedule a Professional Heating Tune-Up

The single most important thing you can do is have a licensed HVAC technician inspect and service your heating system before the season starts. A professional tune-up typically includes:

• Inspecting the heat exchanger for cracks (critical for gas furnaces — a cracked heat exchanger can leak carbon monoxide)
• Cleaning the burners and checking ignition
• Testing safety controls and limit switches
• Checking flue and venting for blockages
• Lubricating moving parts
• Measuring airflow and static pressure
• Checking refrigerant levels on heat pump systems

Scheduling in September or early October means you beat the rush and get your pick of appointment times. By November, most HVAC companies on Long Island are booked weeks out.

2. Replace Your Air Filter

A clogged air filter is one of the most common causes of heating problems. A dirty filter restricts airflow, forces your system to work harder, and can cause the heat exchanger to overheat and crack. Before the heating season starts, install a fresh filter — and plan to check it monthly throughout the winter.

For most Long Island homes, a MERV 8 to MERV 11 filter strikes the right balance between air quality and airflow. If anyone in your household has allergies or asthma, a MERV 13 filter is worth considering, but make sure your system can handle the increased resistance.

3. Test Your Thermostat

Switch your thermostat from cooling to heating mode and set it a few degrees above the current room temperature. Your system should kick on within a minute or two. If it does not respond, check the batteries (for battery-powered thermostats) and make sure the system switch is set to "Heat" rather than "Cool" or "Off."

If you have an older thermostat, fall is a great time to upgrade to a programmable or smart thermostat. A smart thermostat can reduce your heating bills by 10 to 15 percent by automatically adjusting temperatures when you are asleep or away from home.

4. Clear the Area Around Your Heating Equipment

Furnaces and boilers need adequate clearance for safe operation. Check that nothing has been stored near your heating unit over the summer — boxes, holiday decorations, and laundry are common culprits. Most manufacturers require at least 30 inches of clearance on all sides.

For homes with baseboard radiators or cast iron radiators, make sure furniture has not been pushed against them over the summer. Blocked radiators cannot distribute heat effectively and can become a fire hazard.

5. Bleed Your Radiators (Boiler Systems)

If your home is heated by a hot water boiler with radiators, air can become trapped in the system over the summer. Trapped air prevents hot water from circulating properly, leaving some radiators cold or only partially warm. Bleeding your radiators at the start of the season releases that trapped air and restores full heating capacity.

To bleed a radiator, use a radiator key to slowly open the bleed valve at the top of the unit. Hold a cloth underneath to catch any water. When water (rather than air) starts to drip out, close the valve. Check your boiler pressure gauge afterward — if pressure dropped, you may need to add water to the system.

6. Check Your Carbon Monoxide Detectors

Carbon monoxide is colorless and odorless — you cannot detect it without a working CO detector. Before you fire up your heating system for the first time each fall, test every CO detector in your home and replace the batteries. If your detectors are more than 5 to 7 years old, replace them entirely.

New York State law requires carbon monoxide detectors in all one- and two-family homes. Make sure you have one on every level of your home and within 15 feet of each sleeping area.

7. Inspect Your Vents and Registers

Walk through your home and check that all supply and return air vents are open and unobstructed. It is a common misconception that closing vents in unused rooms saves energy — in reality, it increases static pressure in your duct system and can damage your equipment. Make sure furniture, rugs, and curtains are not blocking any registers.

Also check your outdoor exhaust vents. High-efficiency furnaces have PVC exhaust pipes that exit through the side of your home. Make sure these are clear of debris, bird nests, and vegetation.

8. Inspect Your Ductwork for Leaks

The U.S. Department of Energy estimates that the average home loses 20 to 30 percent of heated air through leaky ducts. On Long Island, where heating costs are already high, duct leaks can add hundreds of dollars to your annual energy bills. Look for obvious gaps, disconnected sections, or areas where insulation has fallen away. Sealing duct leaks with mastic sealant or metal tape (not standard duct tape, which fails over time) can make a significant difference in both comfort and efficiency.

9. Stock Up on Filters

Buy a three- to six-month supply of filters before the heating season starts. You are more likely to change them on schedule if they are already on hand. Write the date on the filter when you install it so you always know when it was last changed.

Do Not Wait Until the First Cold Night

Every fall, homeowners across Long Island wait until the temperature drops to discover their heating system is not working. By then, emergency service calls are expensive and wait times can stretch for days. A little preparation in September can save you significant money, stress, and discomfort when winter arrives.

A1 Heating & Air Conditioning has been serving Long Island homeowners since 2019. Our fall heating tune-ups are thorough, affordable, and scheduled at your convenience. Call us at 631-331-2102 to book your appointment before the rush begins.