Evanston Boiler Replacement Guide (2026)

Evanston is the largest and densest city on the North Shore, and it heats differently than its neighbors. Drive through the older parts of town and you are looking at pre-war brick homes, two-flats, and courtyard apartment buildings, many of them still warmed the way they were built to be warmed: a boiler in the basement pushing heat out to radiators in every room. If you own one of these homes, replacing that boiler is a different project than swapping a suburban furnace, and it helps to understand what you are actually dealing with before you get quotes.

Why Evanston is a boiler town

The city's housing stock skews old and solid. A lot of it went up before forced-air heating was standard, which means the heating system was designed around water or steam, not ducts. Those masonry two-flats and courtyard buildings were built with boilers and radiators, and generations later, that is still how many of them run.

This has one big practical consequence: many Evanston homes have no ductwork at all. That shapes every decision downstream, from how you replace the boiler to how you ever add air conditioning. It is why boiler replacement is such common work in this specific city compared to the more suburban towns farther up the shore.

Steam versus hot-water: know which you have

Before anything else, figure out which kind of system heats your home, because they are genuinely different animals.

• Steam systems boil water into steam, which rises through the pipes to the radiators on its own pressure, gives up its heat, condenses back to water, and drains back down. They typically have one pipe per radiator, a sight glass on the boiler, and radiators that hiss and clank as they warm up. Steam is common in the oldest Evanston buildings.
• Hot-water (hydronic) systems use a pump to circulate hot water through the radiators and back. They run quieter, use a circulator pump, and often have a small expansion tank. Many homes have been converted to or built with hot water.

Which one you have determines what your replacement options are. Steam systems, in particular, have their own rules about piping and pressure that a qualified installer has to respect. This is not a place for guesswork, and it is not a place for a contractor who mostly does furnaces to improvise.

Standard replacement versus a condensing conversion

Here is the decision that drives a lot of the cost and value in an Evanston boiler project: do you replace like-for-like with a modern standard-efficiency boiler, or convert to a high-efficiency condensing boiler?

A condensing boiler extracts extra heat from the exhaust that a conventional boiler sends up the flue, which is where the efficiency gains come from. It is genuinely more efficient. But it only works when the rest of the system cooperates. Condensing boilers run best at lower water temperatures and need specific venting (often through a sidewall with plastic pipe) and appropriate near-boiler piping to actually condense and hit their rated efficiency.

That is the catch. In some Evanston homes the near-boiler piping and venting make a condensing conversion straightforward and worthwhile. In others - particularly certain steam setups or homes where the radiators were sized for high water temperatures - a high-efficiency conversion may not deliver its promised savings, or may require enough additional work that a well-chosen standard-efficiency replacement is the smarter, more honest choice. A good installer will look at your actual piping, venting, and radiators and tell you which path fits, rather than pushing the most expensive option by default. Our guide on boiler replacement cost in Illinois digs further into these tradeoffs.

Adding cooling where there was never any

Almost every Evanston boiler owner runs into the same summer question: how do I get air conditioning in a house with no ductwork? Tearing ducts into a finished pre-war home is invasive and expensive, and it often is not worth it.

This is where ductless mini-splits have quietly become the standard answer. A mini-split is a heat pump with an outdoor unit and one or more indoor heads connected by a small line set, so it needs no ducts at all. It provides real cooling in summer (and can add heat in shoulder seasons too), room by room, without disturbing your radiators or your plaster. For radiator-heated Evanston homes, keeping the boiler for winter and adding ductless for summer comfort is one of the most sensible combinations available. Our ductless mini-split guide covers where it shines and its honest limits, including the visible indoor head.

What it costs

Boiler replacement is a bigger job than a furnace swap, and Evanston's older, tighter homes can add labor. Typical installed ranges on the North Shore run roughly $7,000 to $15,000, and where you land inside that depends heavily on your specific home: steam versus hot water, standard replacement versus condensing conversion, the condition of your existing piping and venting, and how accessible the basement mechanical room is. Those figures move over time and with equipment choices, so treat them as a starting point. The only way to get a real number is a written in-home estimate where an installer sees your actual system.

Rebates worth checking

Efficiency incentives can offset some of the cost, and they are worth confirming before you buy:

• Nicor combi boiler rebate of up to roughly $500 has been available for qualifying high-efficiency combi boilers. Amounts and eligibility change, so verify the current program before counting on it.

One important note on federal help: the federal 25C tax credit expired for installs placed in service after December 31, 2025, so a boiler installed in 2026 does not qualify for it. Utility rebates like Nicor's are separate from that and remain the place to look. Always verify current amounts directly with the utility, since these programs update.

Evanston's own permit and inspection

Evanston runs its own building and mechanical permit process, independent of Wilmette, Winnetka, or any other North Shore town. A boiler replacement in Evanston generally requires a mechanical permit and a final inspection, and a licensed installer normally pulls the permit and coordinates the inspection as part of the job.

The inspection is not busywork. On a boiler, it confirms that venting, gas connections, and combustion safety were done correctly - exactly the parts of the job you cannot see once the unit is running. And it protects you at resale, since unpermitted mechanical work can surface during a buyer's inspection. For current Evanston fees and timing, confirm with the city's building department, since those specifics vary and change. We cover the broader picture in our North Shore HVAC permits guide.

Putting it together

If you own an older home in Evanston, a boiler replacement is a chance to make a few good decisions at once: confirm whether you are on steam or hot water, honestly evaluate whether a condensing conversion fits your piping and venting or whether a standard replacement is the smarter buy, and consider finally solving summer comfort with ductless cooling. Do it with a licensed, insured installer who knows the difference between these systems and pulls the Evanston permit as a matter of course.

You can learn more about your neighborhood and typical work on our Evanston page, and if you are weighing whether to stay with a boiler at all, our comparison of boiler versus forced air in older North Shore homes is a good next read.

When you are ready to plan it out for your specific home, get a written free estimate or call (847) 752-4418.