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BCH Chicago ConstructionHVAC · Division 23 (847) 691-2993 Invite us to bid

Commercial HVAC · General Contracting · Chicagoland · Est. 2017

Systems that cannot fail.Buildings that cannot close.

BCH Chicago Construction replaces complete mechanical systems inside occupied hospitals, schools and industrial facilities — under permit, on a written phasing plan, without shutting a single department down. We also take select general contracting, and residential heating and cooling for Chicago homeowners.

Invite us to bid See how a replacement runs
Supply air
55.0°F
Static pressure
1.42in. w.c.
Experience mod
0.87EMR
Active sites
6live
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01 — The equipment

Inside the machine that keeps the building alive

An air handling unit is five jobs stacked in one casing. Scroll to pull it apart: return air in, filtered, conditioned, driven, and back out to the floor. This is the box we rig into mechanical rooms that were built before it existed.

Section 01

Return air

Air comes back from the floor carrying everything the building did that day. On a hospital job it is already under a pressure regime we are contractually required to hold.

Section 02

Filter bank

Multi-stage filtration — MERV pre-filters ahead of final banks, HEPA where the space requires it. Sized so the fan can still hit design airflow when the media loads.

Section 03

Coil

Chilled and heating water crossing the air stream. We set the coil, run the hydronic piping, and build the temporary loop that keeps a wing conditioned while the plant is open.

Section 04

Supply fan

The part that has to be balanced, not just installed. Variable speed, driven off a sequence that has to match the system already in the building — not the one in the catalog.

Section 05

Supply plenum

Out through ductwork we fabricate, seal and leakage-test ourselves. Then balanced, functionally tested, and retested on anything that did not hold the first time.

02 — Air distribution

Every room’s CFM has to add up before anyone picks equipment

Airflow is designed from the room outward. Each room’s CFM sets its diffuser, the diffusers set the branch, the branches set the trunk, the trunk sets the static pressure the blower has to overcome — and only then can you honestly size the unit. Break one link and the top floor never gets cold. Change a scenario and watch where the air goes.

3-story office · 12 zones · single rooftop unit

Illustrative figures for a 7,500 CFM building at 400 CFM per ton. Your building gets a real room-by-room load calculation — not a rule of thumb.

03 — Infection control

Negative pressure, held and verified — every day the barrier is open

Corridor+0.00
Containment−0.031
Air changes12 ACH
ExhaustHEPA
Class IV containment — air pulled in, filtered, exhausted out

A mistake in a hospital is a Joint Commission citation, not a punch list item. Every phase we run is written against an approved infection control risk assessment before anything is opened.

Hard barriers go up first. Negative pressure is established and monitored daily, exhaust is HEPA-filtered, debris leaves on a controlled route at a controlled hour, and the permit is signed off with infection prevention each day it is open. Departments come back one at a time — airflow, filtration, pressure relationship and alarm verified on each before the next one comes down.

  • ICRA containmentClass I–IV

    Barriers, negative air machines, anteroom sequencing, daily permit sign-off with infection prevention.

  • Interim life safety measuresILSM

    Temporary alarm coverage, egress rerouting, extinguisher placement and fire watch where our scope touches life safety.

  • Pressure relationshipsVerified

    Operating rooms, isolation rooms and protective environments hold their required differentials after every phase.

04 — Scope of work

Division 23, carried start to finish

Sheet metal, hydronic and refrigerant piping, equipment setting and controls are self-performed by our own crews — not chased across three vendors on a schedule none of them own. That matters most on a cutover weekend.

01AHU

Air handler replacement

Rigging into tight mechanical rooms, temporary conditioning through changeover, staged cutovers that hold pressure relationships in critical spaces.

02Self-perform

Ductwork & sheet metal

Fabrication, installation, sealing and leakage testing. Existing duct is surveyed before demolition so what stays is documented.

03CHW / HHW

Hydronic & refrigerant piping

Chilled and heating water, pumps, valve replacement and temporary loops so plant work never leaves a wing without cooling in August.

04RTU

Rooftop & packaged units

Crane picks, curb adaptation, structural coordination and single-day changeouts scheduled around building operations.

05BAS

Controls & automation

Sequence integration with the system already installed, point-to-point verification, and graphics the operating engineer can actually read.

06Cx

Commissioning support

Balancing, functional performance testing, and correction of anything that does not hold when it is retested.

07Select work

General contracting

When a job is simpler with one contractor carrying more than the mechanical scope, we take it. Thirty years of general construction sits behind this company — houses, apartment buildings, churches, restaurants and office interiors, built foundation to finish before we specialized in HVAC. On select projects that means we hold the whole thing: the other trades, the schedule, and one number the owner can budget against.

05 — Sequence

Six stages, and you always know which one we are in

Every project runs the same way, in the same order, with the same paperwork behind each step. Hover any stage to hold it.

  1. 01

    Preconstruction

    Scope review, budget, equipment selection and lead times. Long-lead items are identified while there is still time to do something about them.

    Weeks 1–4
  2. 02

    Coordination

    Shop drawings, submittals, BIM clash resolution, and written sign-off from the engineer and the other trades before fabrication starts.

    Before fabrication
  3. 03

    Phasing & protocols

    The written plan for how the building keeps running: sequence, temporary systems, containment, shutdown windows and notification lead times.

    Agreed with the facility
  4. 04

    Installation

    Permitted work with daily field reports, inspection coordination, and a superintendent on site who answers the phone the first time it rings.

    Under permit
  5. 05

    Startup & commissioning

    Balancing, functional testing, verification of pressure relationships and control sequences, and correction of anything that fails retest.

    Verified, then re-verified
  6. 06

    Closeout

    As-builts, O&M manuals, warranty registration, owner training, and a service plan for the equipment we just installed.

    Handover
Stage 01 — Preconstruction

06 — The record

An operation you can budget around

Numbers a general contractor will verify anyway, published before they ask.

Safety — experience modification

Lower is better. Industry baseline 1.00.

0.87

EMR letter available on request

Occupied-facility phasing — typical hospital replacement

Departments come back online one at a time. No unplanned shutdowns.

Contract volume by year

Completed contract value, 2021–2026.

Market mix

Where the volume actually comes from.

30+Years the founder has been building
2017BCH Chicago Construction founded
85+Projects completed
24/7Emergency response, contract buildings
No. 2025-118Healthcare

Hospital HVAC replacement

Complete air handler and duct replacement across four floors of an occupied acute care facility, phased over fourteen months with no unplanned department shutdowns.

Delivery
Design-assist
Value
$4.2M
Area
180,000 SF
Year
2025–26
No. 2024-072Hospitality

Restaurant chain ventilation rollout

Type I hoods, make-up air and rooftop units across fourteen locations on a rolling schedule. Each store closed Sunday night and served lunch Tuesday — grease duct welded, fire suppression tied in, exhaust balanced and signed off before the doors reopened.

Delivery
Negotiated
Value
$1.9M
Locations
14 stores
Year
2024–25
No. 2024-039Institutional

School mechanical upgrade

Full mechanical replacement across three buildings inside an eleven-week summer window. Unit ventilators, boilers and controls, balanced and signed off before staff came back in August.

Delivery
Design-build
Value
$2.6M
Schedule
11 weeks
Year
2024
No. 2024-096Multifamily

Apartment complex mechanical

Vertical stack heat pumps in 240 occupied units, corridor make-up air, and garage ventilation with CO monitoring. Phased one riser at a time so no resident was without heat for more than a single day.

Delivery
Design-build
Value
$2.8M
Units
240 units
Year
2024–25
No. 2023-041Aviation

O’Hare concourse air handlers

Four air handlers serving a live concourse, replaced on night shifts inside the window between last arrival and first departure. SIDA-badged crews, prevailing wage and certified payroll, and not one gate taken out of service.

Delivery
Plan & spec
Value
$6.4M
Airflow
160,000 CFM
Year
2023–25
No. 2023-077Financial

Bank headquarters chiller plant

Two 300-ton chillers, primary and secondary pumps, and a VAV upgrade in a twelve-story headquarters. Temporary chillers on the street held the trading floor and data room at temperature through the entire changeover.

Delivery
Design-assist
Value
$3.6M
Capacity
600 tons
Year
2023

07 — The builder

The company is nine years old. The builder is not.

Battulga Chultemsuren, founder and president of BCH Chicago Construction, on a Chicago jobsite.
Battulga ChultemsurenFounder & President — on site, Chicago

“I have spent more than thirty years building. Houses, apartment buildings, churches, restaurants, offices — and the mechanical systems that keep all of them running.”

Battulga Chultemsuren started BCH Chicago Construction in 2017 to do that work his own way: take the job seriously, finish what you start, hand back a building that works. He is on every project the company takes. If something is wrong on your job you call him directly, and the person who quoted the work is the person who runs it.

That breadth is why a mechanical scope rarely surprises us. Before specializing in HVAC he built whole buildings, foundation to finish. When a crew opens a wall in a fifty-year-old hospital, we already have a fair idea of what is behind it.

Built over three decades

  • Healthcare facilities
  • Custom residences
  • Apartment complexes
  • Churches
  • Restaurants
  • Office interiors
  • Retail build-outs

08 — Prequalification

Everything your prequal form asks for, ready to send

If you are building a bid list you need documents before you need a conversation. Ask and they are in your inbox the same day.

ItemDetailForm
Entity & taxBCH Chicago Construction, Inc. Illinois corporation, founded 2017.Available
LicensingMunicipal contractor licenses for every jurisdiction we work in.Available
General liability$2M per occurrence, $4M aggregate, with completed operations. Additional insured endorsements on request.COI
Auto & umbrella$1M combined single limit, $5M excess liability.COI
Workers' compStatutory coverage for all field personnel. Current experience modification rate 0.87.EMR letter
BondingSingle project capacity $4M, aggregate $10M.Surety letter
Safety recordOSHA 300A logs for the last three years, written safety program, toolbox talk records.3-year history
TrainingOSHA 30 supervision, OSHA 10 field, EPA 608 refrigerant certification, ICRA healthcare construction training.Certificates
FinancialReviewed financial statements and work-in-progress schedule, released under NDA.Under NDA
ReferencesGeneral contractors, owners and engineers from the last three years, with project values and contacts.On request

Residential work — furnace and air conditioning replacement, heat pumps and mini-splits for homeowners in the Chicago area — is scheduled around commercial projects. Call and we will tell you honestly when we can get there.

09 — Contact

Send us the drawings

We bid commercial and institutional work across Chicago and the collar counties. Send an invitation with a bid date and we will confirm whether we are covering it within one business day.

Bid invitations are answered within one business day. For a system that is down right now, call instead.

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