Practical guides from the local team.
Straightforward advice for planning service, spotting problems early and understanding the options.
- Emergency Repair
What Counts as an HVAC Emergency?
Not every HVAC problem needs a middle-of-the-night call, but some cannot wait. Here is how to tell a true emergency from an urgent repair or a problem that can safely wait until morning, with the first steps to take in each case.
Read the guide - Emergency Repair
Smell Gas Near Your Furnace? Exactly What to Do
A rotten egg smell near your furnace is a warning you should never ignore. Here are the exact steps to take, the mistakes to avoid, who to call in Chicago and what happens next, from the gas company's visit to getting your heat safely back on.
Read the guide - Emergency Repair
No Heat at Night: Safe Steps Until Help Arrives
Losing heat in the middle of a cold Chicago night is stressful. This guide gives you a calm, step-by-step plan: quick checks that often restore heat, how to keep everyone warm safely while you wait, how to protect pipes and what never to use for heat.
Read the guide - Emergency Repair
AC Out in a Chicago Heat Wave: Staying Safe
When the air conditioner fails during a Chicago heat wave, indoor temperatures can climb to dangerous levels, especially on upper floors. Here is how to check for quick fixes, keep your home as cool as possible, protect vulnerable people and recognize heat illness.
Read the guide - Local Guides
Chicago Heat Rules for Landlords and Tenants
Chicago requires landlords to keep rental units heated to minimum temperatures for most of the year. Here is a plain-language overview of the heat ordinance: the dates, the temperatures, how they are measured, how tenants can report problems and how owners can stay compliant.
Read the guide - Safety
Space Heater Safety While You Wait for Repairs
When the heat goes out in a Chicago winter, a space heater can keep a room livable until repairs are done. Used carelessly, it can also start a fire. Here is how to choose and use space heaters safely, and which heat sources you should never use indoors.
Read the guide - Maintenance
Fall Furnace Checklist for Chicago Homeowners
The first cold night of the season is the worst time to discover a furnace problem. This fall checklist covers what Chicago homeowners can do themselves in an afternoon, what a professional tune-up should include and the warning signs to act on before winter.
Read the guide - Maintenance
Spring AC Tune-Up Checklist
Chicago's first hot spell tends to arrive suddenly, and that is when weak capacitors, clogged drains and dirty coils show up. This spring checklist covers what you can do yourself, what a professional tune-up should include and the warning signs to fix before summer.
Read the guide - Maintenance
How Often to Change Your Furnace Filter (MERV Ratings Made Simple)
The furnace filter is the cheapest part of your HVAC system and one of the most important. Here is how often to change it in a Chicago home, what MERV ratings mean, how to pick the right filter and why the highest rating is not always the best choice.
Read the guide - Maintenance
Best Thermostat Settings for Chicago Winters
Your thermostat settings have a big effect on comfort and gas bills through a long Chicago winter. Here are practical settings for day, night and time away, how setbacks work with different heating systems and the limits you should not go below.
Read the guide - Maintenance
Dry Winter Air: Whole-Home Humidifier Guide
Chicago winters bring very dry indoor air: static shocks, dry skin, cracking woodwork and rooms that feel colder than the thermostat says. Here is why it happens, what humidity level to aim for and how whole-home humidifiers can help without causing condensation.
Read the guide - Maintenance
Protecting Your HVAC From Snow, Ice and the Polar Vortex
Extreme cold, heavy snow and ice are hard on heating systems. Blocked vent pipes, buried heat pumps, frozen condensate lines and overworked furnaces cause many winter emergencies. Here is how Chicago homeowners can prepare and respond.
Read the guide - Buying Guides
Do Heat Pumps Work in Chicago Winters?
Heat pumps have improved dramatically, and modern cold-climate models keep heating well below freezing. But Chicago winters are demanding. Here is an honest look at how heat pumps perform here, when they make sense and how to plan for the coldest nights.
Read the guide - Repair Tips
Heat Pump Blowing Cold Air: Defrost Mode vs. a Real Problem
A heat pump that blows cool air in winter is not always broken. Defrost cycles, lower supply temperatures and backup heat settings all affect what you feel at the vents. Here is how to tell normal operation from a problem that needs service.
Read the guide - Buying Guides
Heat Pump vs. Furnace for Chicago Homes
Choosing between a heat pump and a gas furnace is one of the biggest HVAC decisions Chicago homeowners face today. Each has real strengths in a cold climate. Here is a clear comparison, plus the hybrid option many local homes end up choosing.
Read the guide - Buying Guides
Dual-Fuel HVAC Systems Explained
Dual-fuel, or hybrid, heating pairs an electric heat pump with a gas furnace and lets each handle the weather it is best at. For many Chicago homes, it is the most practical way to add efficient heat pump heating without giving up strong heat in a polar vortex.
Read the guide - Repair Tips
Boiler Losing Pressure: Causes and When to Call
A hot water boiler that keeps losing pressure will eventually stop heating, and the cause is usually a leak, a failing component or a waterlogged expansion tank. Here is how boiler pressure works, what normal looks like and how to track down the problem.
Read the guide - Repair Tips
Boiler On but No Heat: Troubleshooting Guide
When the boiler seems to be on but the radiators stay cold, the problem is usually somewhere between the boiler and the rooms: low water, air, a stuck pump or valve, or a control issue. This guide walks through hot water and steam systems step by step.
Read the guide - How-To Guides
How to Bleed Radiators (and When You Shouldn't)
Bleeding a hot water radiator is one of the few boiler jobs most homeowners can do themselves. Here is how to tell when it is needed, how to do it safely, what to do afterward and why you should never try it on a steam radiator.
Read the guide - How-To Guides
Steam or Hot Water Boiler? How to Tell Which One You Have
Steam and hot water boilers look similar at a glance, but they work differently and need different care. Knowing which one you have is the first step to troubleshooting cold radiators, noises and pressure problems. Here is how to tell in a few minutes.
Read the guide - Buying Guides
Boiler Replacement in Chicago Two-Flats and Greystones
Replacing the boiler in an older Chicago multi-unit building is a bigger decision than swapping a furnace. Steam or hot water, standard or condensing, one boiler or several: here is what owners should weigh, what drives cost and which 2026 rebates apply.
Read the guide - Repair Tips
Boiler Noises: Kettling, Gurgling and Whistling Explained
Boilers and radiators make plenty of sounds, and many are normal. Others point to scale, trapped air, low water or failing parts. Here is how to interpret the noises from hot water and steam systems, and when a sound means you should call.
Read the guide - Repair Tips
Ice on Your AC Lines? Why Coils Freeze and What to Do
Ice on an air conditioner sounds backwards, but it is one of the most common summer service calls. Here is why AC coils and lines freeze, how to thaw the system without damaging it, and how to tell a simple airflow problem from a refrigerant leak.
Read the guide - Repair Tips
AC Leaking Water Inside the House: Causes and Fixes
A puddle under the furnace or a stain on the ceiling during a heat wave usually means your air conditioner's condensate water is not draining. Here is where that water comes from, the most common causes of leaks and how to stop the damage fast.
Read the guide - Repair Tips
AC Won't Turn On? What to Check Before You Call
When the AC will not start on the first hot day of the year, the cause is often a setting, a breaker or a safety switch. Work through these checks in order before you book a service call, and know which symptoms mean you should stop and call.
Read the guide - Buying Guides
Repair or Replace Your AC? The 50% Rule and Other Ways to Decide
When an older air conditioner breaks down in July, you have to decide fast whether to fix it or replace it. These rules of thumb, plus a few Chicago-specific factors, help you make a choice you will not regret next summer.
Read the guide - Buying Guides
What Size AC Does a Chicago Home Need? (Manual J Explained)
Bigger is not better when it comes to air conditioners. An oversized unit cools fast but leaves the house clammy, and an undersized one runs nonstop on hot days. Here is how proper AC sizing works and what Chicago homeowners should ask for.
Read the guide - Repair Tips
Strange AC Smells: Musty, Burning or Rotten Egg
An air conditioner should not have a noticeable smell. When it does, the odor is often a clue to the cause: mold, an electrical problem, a dead animal or, occasionally, something dangerous. Here is how to read the most common AC smells.
Read the guide - Repair Tips
Furnace Making Loud Noises? What Each Sound Means
Furnaces are never silent, but new or louder sounds usually point to a specific part. Here is how to read banging, squealing, rattling, humming and more, and which sounds mean you should shut the system off.
Read the guide - Repair Tips
Furnace Won't Turn On? A Chicago Homeowner's Troubleshooting Checklist
A furnace that will not start is often something simple: a thermostat setting, a tripped breaker or a full condensate trap. This checklist walks you through the safe checks in order, and tells you when to stop and call.
Read the guide - Repair Tips
Furnace Ignitor and Pilot Light Problems Explained
If your furnace clicks, glows or tries to start but never makes heat, the problem is usually in the ignition system. Here is how ignitors, pilot lights and flame sensors work, why they fail, and what a repair involves.
Read the guide - Buying Guides
How Long Does a Furnace Last in Chicago? 7 Signs It's Time to Replace
A well-maintained gas furnace typically lasts around 15 to 20 years, but Chicago winters, sizing and maintenance all change that number. Here are the signs your furnace is near the end, and how to decide between one more repair and a new system.
Read the guide - Buying Guides
What Affects Furnace Replacement Cost in Chicago
Furnace replacement quotes in the Chicago area vary widely, and the price of the furnace itself is only part of the story. Here is what actually drives the cost, how to compare quotes fairly and which rebates apply in 2026.
Read the guide - Safety
Carbon Monoxide and Your Furnace: A Safety Guide for Chicago Homes
Carbon monoxide has no color and no smell, and a faulty furnace is one of the most common sources in the home. Here is how CO problems start, what the symptoms are, what Illinois law requires for alarms and what to do if one goes off.
Read the guide - Repair Tips
Furnace Blowing Cold Air? 7 Causes to Check in Chicago
Your furnace is running but the air is cold. Here are the 7 causes we find most often in Chicago homes, what each one costs to fix, and when to call a pro.
Read the guide - Repair Tips
Radiators Not Heating? Steam and Hot Water Fixes for Chicago Homes
Cold radiators in a Chicago greystone or two-flat usually trace back to trapped air, a stuck steam valve, or a failing circulator. Here's how to diagnose and fix both steam and hot water systems.
Read the guide - Repair Tips
AC Running but Not Cooling? A Chicago Summer Checklist
Your AC is running but the house won't cool. Here's the exact Chicago checklist our techs use - filters, coils, refrigerant, and when to call for repair.
Read the guide - Repair Tips
Why Is My Furnace Short Cycling During a Chicago Cold Snap?
Your furnace keeps turning on and off quickly because of a dirty flame sensor, clogged filter, or oversized unit. Here's how Chicago homeowners diagnose and fix it.
Read the guide - Repair Tips
Banging Steam Pipes in Chicago Greystones: Causes and Fixes
That jackhammer clang in your greystone's risers is water hammer, not a ghost. Here's why Chicago steam pipes bang and how to quiet them for good.
Read the guide - Emergency Repair
What to Do When Your Heat Goes Out in a Chicago Polar Vortex
Heat out during a Chicago polar vortex? Here's the exact order of steps to stay warm, stop pipes from freezing, and get emergency furnace repair fast.
Read the guide
Need HVAC Chicago IL service today?
(312) 638-0812No heat, no cooling, or a system making noise you don't like? Call (312) 638-0812. We'll give you a real arrival window, a straight diagnosis and a price before we start.
Get in touch with us
Call (312) 638-0812 or email info@hvacchicagopro.com and tell us what your system is doing. We answer the phone during business hours and connect urgent no-heat and no-cooling calls with available local technicians. If you leave a message after hours, we'll call you back with a plan.