Can I put a gas fireplace into an existing wood-burning firebox?

Usually yes. A gas insert slides into the existing masonry opening and vents through a liner run up the old flue. The chimney has to be sound and correctly sized for the new appliance, which is why the job starts with an inspection rather than a measurement.

What is the difference between direct vent and B-vent?

A direct vent unit is sealed from the room and draws combustion air from outside through a coaxial pipe, which makes it the most efficient and the most flexible to site. A B-vent unit draws air from the room and vents vertically. Direct vent is the default choice for most installations today.

Are vent-free gas fireplaces allowed?

They exist, but some municipalities restrict or prohibit them and they add moisture to the room. We confirm local rules before specifying one and will normally recommend a vented appliance instead.

How long does installation take?

A straightforward insert into a sound existing chimney is typically one to two days. New construction, a new gas line, or a fireplace being sited where none existed will take longer and may involve other trades.

Does a gas fireplace still need servicing?

Yes. Burners, pilot assemblies, glass seals and venting all need annual attention, and the venting still needs inspection. Gas burns cleaner than wood but the appliance and flue are not maintenance free.

Gas Fireplace Installation

Name: Chimney Monkey
Price range: $$

Gas fireplace installation adds clean heat, easy control, and a modern look. Moreover, today’s units deliver high efficiency and steady comfort. Therefore, we size, vent, and finish your system for safe, reliable performance.

Which Option Fits Your Home?

For example, choose the path below to match your space and goals.

✓ Direct-vent fireplaces: sealed glass, outside air, and strong efficiency.
✓ Gas inserts: retrofit into existing masonry or prefab boxes.
✓ Log sets: quick upgrade for an open fireplace (vented or, where allowed, vent-free).

Our Installation Process

In short, the steps are clear from start to finish.

Assess: First, we review layout, gas supply, vent path, and code.
Design: Next, we select the unit, surround, and finishes. Additionally, we can coordinate mantels and stone.
Install: Then, we complete gas, venting, electrical, and required clearances.
Verify: Finally, we start up, leak-check, confirm draft, and do a user walkthrough.

Why Choose Chimney Monkey

Furthermore, you get proven workmanship and friendly support.

✓ Licensed, code-compliant installs with clear pricing
✓ Top brands, smart controls, and custom surrounds
✓ Clean job sites and on-time crews

Ready to plan your project? Alternatively, schedule an assessment or request a quote. Additionally, call 847-994-4388 for fast help with your gas fireplace installation.

Proudly Serving Chicago’s North Shore

With years of experience and thousands of satisfied customers, our team continues to deliver exceptional chimney care across the North Shore. We’re dedicated to protecting your home year-round while expanding our reach to new towns every season. Our growing team ensures prompt, reliable service—wherever you are.

Core Service Areas

Specifically, we proudly serve Evanston, Wilmette, Kenilworth, Winnetka, Glencoe, Highland Park, Highwood, Lake Forest, Lake Bluff, Deerfield, Riverwoods, Bannockburn, Northfield, Northbrook.

Extended Service Areas

We also cover Arlington Heights, Barrington, Buffalo Grove, Des Plaines, Glenview, Hawthorn Woods, & Fort Sheridan.

Therefore, no matter where you live in the North Shore, Chimney Monkey is ready to help. In addition, our team ensures quick response in all listed areas. Likewise, we adapt to local needs for safer results.

📞 Call Chimney Monkey at (847) 994-4388 and let us take care of your chimney needs!

What a gas fireplace installation involves

A gas fireplace is an appliance, a gas supply and a vent, and the install is only as good as the weakest of the three. We size the unit to the room, confirm the gas line can carry it, work out how it will vent, and then handle the finish so it looks like it belongs in the house rather than bolted into it. Most of our work is on the North Shore, where the housing stock ranges from 1920s masonry to new build, and those two situations need very different answers.

Direct vent, B-vent and vent-free

Direct vent units are sealed from the room and pull combustion air from outside through a coaxial pipe. They are the most efficient, the safest for tightly built houses and the easiest to site, which is why they are our usual recommendation. B-vent units take air from the room and vent vertically, which suits some retrofits. Vent-free units need no flue at all, but they put moisture and combustion products into the living space and some municipalities restrict them, so we check local rules before specifying one.

Converting a wood-burning fireplace

This is the most common job we do. A gas insert fits inside the existing masonry firebox and vents through a liner run up the old flue. The attraction is obvious: you keep the hearth and the surround, lose the mess, and gain a fire that starts with a switch. The catch is that the old chimney has to be sound and correctly sized for the new appliance, so the work begins with a chimney inspection, and any chimney repair gets done before the insert goes in.

Venting and liners

Gas appliances produce cooler, wetter flue gases than wood. Put those into an oversized old clay flue and they condense, which corrodes the liner and can push moisture back into the masonry. Correct liner sizing is not optional detail work, it is the difference between an installation that lasts and one that quietly damages the chimney.

Finishing the job

Surrounds, hearths and mantels are part of the installation, not an afterthought. See fireplace mantel installation. Once the unit is running we set the flame, check the seals and show you how to operate and service it. Annual fireplace cleaning keeps it that way.

Common questions

Can a gas unit go into my existing firebox? Usually. The flue has to be sound and correctly sized, which the inspection establishes.

Direct vent or B-vent? Direct vent for most homes: sealed from the room, more efficient, easier to place.

How long does it take? One to two days for an insert into a sound chimney. Longer for new gas runs or a fireplace where none existed.

Does it still need servicing? Yes, annually. Burners, pilots, seals and venting all need checking.

To talk through an installation or a conversion anywhere in Cook or Lake County, call 847 994 4388.

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