Heating and cooling: fix it for less

Quick checks before you call

Some no-heat and no-cooling calls turn out to be simple. Before you pay for a service visit, check that:

• The thermostat is set to heat or cool, the set temperature is right, and its batteries aren’t dead.
• The furnace or air handler switch (it often looks like a light switch) is on, and the breaker hasn’t tripped.
• The air filter isn’t clogged, and supply and return vents aren’t blocked by furniture or rugs.
• The outdoor AC unit is clear of leaves, snow and debris.

If you smell gas, leave the house and call your gas utility’s emergency line from outside. If a carbon monoxide alarm goes off, get everyone out and call 911.

Repair or replace?

Ask the technician for the age of the system, what failed, and a written price for the repair. If you’re also quoted a replacement, ask for both in writing so you can compare. Questions worth asking:

• Is this a part that commonly fails, or a sign of bigger problems?
• Is the part still under the manufacturer’s warranty? Do I need to have registered the equipment?
• If I replace, what size system does my home need, and how did you calculate it? A properly sized system matters more than the biggest one.
• What would a more efficient system change in my monthly energy costs?

If someone pushes a full replacement on the first visit, it’s reasonable to get a second opinion. Note that the federal energy efficient home improvement tax credit (25C) for furnaces, central air and heat pumps ended for equipment installed after December 31, 2025, so check utility rebates instead.

Be careful with add-ons

Maintenance plans can be worth it if they include the spring and fall tune-ups you’d buy anyway, but read what’s covered. Air duct cleaning is another common upsell. EPA says duct cleaning has never been shown to prevent health problems, and recommends it mainly when there’s substantial visible mold, vermin, or excessive dust and debris coming out of the vents.

Getting fair quotes

For a replacement, get at least two written estimates that list the equipment model numbers, efficiency ratings, warranty terms, permit, and removal of the old unit. In Illinois, work over $1,000 needs a written contract or work order that states the total cost. Licensing for HVAC contractors is handled locally, so ask your city or village what’s required.