New Homeowner HVAC Guide: What You Need to Know in Chicago

Step 1: Know What You Have

Before you can maintain or improve your HVAC system, you need to know what you have. Walk through the home and locate:

The furnace or boiler: Usually in the basement, utility room, or mechanical closet. Note the brand, model number, and age (usually on a label inside the unit or on the data plate). Most furnaces last 15–20 years; boilers last 20–30 years.
The air conditioner: The outdoor condenser unit is usually on the side or back of the house. Note the brand, model, and age. Most AC systems last 12–15 years.
The air handler or evaporator coil: Located indoors, usually on top of or next to the furnace. Contains the indoor coil and blower for the AC system.
The thermostat: Note the brand and model. Is it programmable? Smart? Does it control both heating and cooling?
The ductwork: Forced-air systems distribute conditioned air through ducts. Note whether the ducts run through conditioned or unconditioned spaces (attic, crawlspace, unheated basement).
The water heater: Note the type (tank or tankless), fuel (gas or electric), age, and capacity.

Step 2: Get a Professional Inspection

If you did not have a professional HVAC inspection as part of the home purchase process, schedule one now — before you need the system. A professional inspection will:

Verify the furnace or boiler is operating safely (heat exchanger integrity, CO risk, venting)
Check the AC system's refrigerant charge and coil condition
Identify any deferred maintenance or near-term replacement needs
Give you a realistic picture of the system's remaining useful life

D's Air & Heating provides HVAC inspections for new homeowners throughout Chicago. A $95.35 service call fee applies.

Step 3: Immediate Safety Checks

Carbon monoxide detectors: Verify there is a working CO detector on every level and within 15 feet of every sleeping area. Replace any that are more than 7 years old or have no manufacture date visible.
Smoke detectors: Test every smoke detector. Replace batteries. Replace units older than 10 years.
Gas shutoffs: Know where the gas shutoff is for the furnace, water heater, and main gas line. Know how to turn them off in an emergency.
Electrical panel: Locate the electrical panel and identify the breakers for the furnace, AC, and water heater.

Step 4: Understand Chicago's HVAC Calendar

Chicago's climate demands year-round HVAC attention:

Fall (September–October): Schedule a furnace tune-up before the heating season. This is the most important maintenance task of the year.
Winter (November–March): Monitor the system, change filters, check CO detectors.
Spring (April–May): Schedule an AC tune-up before the cooling season.
Summer (June–August): Monitor the AC, change filters, keep the outdoor unit clear.

Step 5: Chicago-Specific Considerations

Older housing stock: Many Chicago homes have steam or hot water boiler systems rather than forced-air furnaces. If you have radiators, you have a boiler system — it requires different maintenance than a furnace.
Humidity: Chicago winters are very dry. Consider adding a whole-home humidifier if the home does not have one.
Duct condition: Older Chicago homes often have leaky or poorly insulated ductwork. If rooms are hard to heat or cool, duct inspection and sealing may help significantly.
Permits: Any HVAC replacement in Chicago requires a City of Chicago mechanical permit. Always verify your contractor pulls permits — it protects you legally and ensures the work is inspected.

D's Air & Heating has served Chicago homeowners since 2009. We are familiar with the city's housing stock and HVAC systems. Contact us at (773) 940-0965 for a new homeowner HVAC inspection or any HVAC service need.