Glencoe HVAC Replacement Guide (2026)

Glencoe's tree-lined streets are filled with large, substantial homes, many built in the early 1900s and still running on the heating systems they were designed around: boilers and radiators. From East Glencoe near the lake to the neighborhoods around the Botanic Garden, this is a village of high-value older houses where HVAC replacement leans toward boiler modernization and adding or upgrading cooling in homes that were never built with ductwork. Understanding that character helps you plan a replacement that fits your home rather than fighting it.

Why Glencoe leans toward boilers

Because so much of Glencoe's housing predates central air, a large share of homes heat through hot-water boilers and radiators, often converted over the decades from their original coal or oil setups. That means two things: the equipment is frequently decades old and due for modernization, and many homes have no ductwork, which shapes every cooling decision. This is why boiler replacement and cooling retrofits, rather than routine furnace swaps, are the heart of the work here.

Modernizing an aging boiler

If your Glencoe home heats through radiators, the central decision in a replacement is whether to replace like-for-like with a modern standard-efficiency boiler or convert to a high-efficiency condensing unit. Condensing boilers extract extra heat from the exhaust and are genuinely more efficient, but they only deliver their rated savings when the near-boiler piping, venting, and radiators cooperate. Some Glencoe homes are straightforward conversions; others, particularly certain systems sized for high water temperatures, are better served by a well-chosen standard replacement. A good installer evaluates your actual piping, venting, and radiators and tells you which path fits, rather than pushing the most expensive option by default. Our boiler versus forced air in older North Shore homes comparison is worth reading if you are weighing whether to stay with radiators.

Solving summer comfort

The classic Glencoe question is how to cool a large older home with no ducts. Tearing conventional ductwork into a finished early-1900s home is invasive and expensive, and it often is not worth it. The practical answers are:

• Ductless mini-splits, which use an outdoor unit and compact indoor heads connected by a small line set, delivering cooling room by room with no ductwork at all. Keeping the boiler for winter and adding ductless for summer is one of the most sensible combinations for a radiator home. See our ductless mini-split guide for where it shines and its honest limits.
• Retrofit or high-velocity central air in homes where the layout allows, giving whole-home cooling through compact ducting.

For homes that do have or can accommodate conventional cooling, central AC replacement sized correctly to the home is the path. An oversized AC cools fast but leaves the house clammy, so a proper load calculation matters.

What it costs

As planning ranges on the North Shore:

• Boiler replacement typically runs $7,000 to $15,000, depending on system type and the condition of your piping and venting.
• Central AC replacement generally lands $4,000 to $8,000.
• Ductless mini-split systems run $4,000 to $14,000 depending on the number of zones.

Glencoe's larger homes can add labor, and these are starting points, not quotes. The only accurate figure comes from a written, in-home estimate where an installer sees your actual system.

Rebates worth checking

• Nicor Gas offers up to about $500 for a qualifying combi boiler, roughly $225 for a qualifying 97% AFUE furnace, and up to about $100 for a qualifying smart thermostat.
• ComEd offers a tonnage-tiered rebate in the $1,400 to $2,000 range for qualifying cold-climate heat pumps, relevant if you add ductless.

Amounts change and some addresses are served by North Shore Gas rather than Nicor, so verify current programs. Our ComEd and Nicor rebates guide covers the details.

Timing your replacement

Replace heating equipment in the shoulder seasons, late spring through early fall, when scheduling is calmer and you have room to compare options and confirm rebate paperwork without rushing. An aging boiler that limps through one more winter is a gamble, and a mid-winter failure in a radiator home is slow and costly to solve in a hurry.

Putting it together

In Glencoe, an HVAC replacement usually means two good decisions at once: honestly evaluate whether a condensing boiler conversion fits your home or a standard replacement is the smarter buy, and finally solve summer comfort with ductless or high-velocity cooling. Do it with a licensed, insured installer who knows older homes and sizes the new equipment to your actual house.

Learn more about local work on our Glencoe page, and when you are ready to plan it for your specific home, get a written free estimate or call (847) 752-4418.