# Office Building HVAC Toronto | Toronto Commercial HVAC

> Office and office tower HVAC in Toronto: chiller plants, cooling towers, VAV, BAS and tenant response. 10-year chiller PM, legionella program, 4-hour comfort SLA.

URL: https://torontocommercialhvac.ca/commercial-hvac-for-offices/

Industries $4,500+ assess

# Commercial HVAC for Toronto Offices & Office Towers | Chillers, Cooling Towers, VAV & Tenant-Service Response | A-Class and B-Class

Last updated: October 10, 2026

Full HVAC for Toronto offices and office towers: chiller plants, cooling towers, VAV, building automation, perimeter heating and tenant service response. Programs include 10-year chiller PM, Reg 611 legionella programs, a 4-hour tenant comfort SLA and Section 44 handover documentation for new buildings.

Chiller plants, cooling towers, VAV, BAS and tenant response for A-class and B-class offices.

-   4-hour tenant comfort SLA
-   10-year chiller PM programs
-   VAV and BAS tuning
-   Section 44 handover documentation

Call (437) 524-2997

[tel:+14375242997 →](tel:+14375242997)

 

Request Service

[/contact/ →](/contact/)

 

View pricing

[#pricing →](#pricing)

![Technicians inspecting a chiller in a Bay Street office tower mechanical penthouse](/images/misc/two-technicians-in-hard-hats-inspecting-a-centrifu.webp)

Quick Facts

Pricing

$4,500+ assess

Emergency response

2-4 hours, 24/7

Labour warranty

90 days repair / 2 years install

Program lead

Marco Russo, Chiller Specialist

Commercial Credentials & Verification

TSSA G1 + G2

Licensed Gas Technicians

ESA

Electrical Safety Authority

313A Refrigeration

Licensed Refrigeration Mechanics

$5M CGL + WSIB

Enbridge-Authorized Since 2006

2-4 Hour Emergency Response 90-Day Labour Warranty on Repairs / 2-Year on Installs 5-Star Commercial Satisfaction 20+ Years Commercial-Only

Common Problems

## What Goes Wrong in Offices & Towers Buildings

### Hot and Cold Tenant Calls

Failed VAV boxes, bad sensors and stuck actuators generate comfort tickets floor by floor.

### Ageing Chiller Plants

Centrifugal machines at year 25+ with rising approach temperatures and no rebuild plan.

### Legionella Exposure

Cooling towers without consistent treatment and sampling records create compliance risk.

### BAS Nobody Trusts

Overridden schedules, broken trends and alarms that everyone has learned to ignore.

Toronto Commercial HVAC

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 runs HVAC programs for Toronto offices and office towers, from A-class downtown towers with central chiller plants to B-class suburban buildings with rooftop units. We cover chillers, cooling towers, boilers, air handling units, VAV, perimeter heating and building automation, plus tenant comfort response.

Office buildings live and die by tenant comfort. Hot and cold calls pile up when VAV actuators fail, sensors drift and schedules get overridden. Upper floors complain first when the chiller plant struggles. Cooling towers need treatment and sampling records to manage legionella risk. And the BAS, which should be the building’s early warning system, is often the part nobody trusts.

Programs start with a plant assessment from about $4,500. Building-wide PM programs typically run $18,000 to $85,000 a year, with a 4-hour tenant comfort SLA.

## What We Cover in Office Buildings

### Central plant

Chillers, cooling towers, boilers and pumps. See 

commercial chiller service

[/commercial-chiller-service/ →](/commercial-chiller-service/)

 and 

cooling tower service

[/cooling-tower-service/ →](/cooling-tower-service/)

.

### Air side

Air handling units, VAV boxes, fan coils, perimeter heating and exhaust.

### Controls

BAS programming, trends, alarms and schedules on Metasys, Desigo, Niagara and Delta. See 

BMS and HVAC controls

[/commercial-bms-controls/ →](/commercial-bms-controls/)

.

### Tenant response

Comfort calls answered under a 4-hour SLA, with root-cause fixes rather than setpoint tweaks.

## Office HVAC Programs by Building Class

| Building | Typical systems | Program focus |
| --- | --- | --- |
| A-class tower | Centrifugal chillers, towers, VAV, full BAS | Plant performance, SLA, legionella |
| B-class mid-rise | Packaged units or small plant, VAV or CAV | Comfort calls, RTU age, controls |
| Suburban campus | RTUs and air-cooled chillers | Phased replacement, energy |

## Proof From Our Office Work

The 42-storey Bay Street tower chiller plant logged an 18% energy reduction after its 2024 compressor rebuild, staged so tenants never lost cooling. In North York, a Yonge-Sheppard tower make-up air replacement restored building pressure over a single weekend.

## Office HVAC Across Toronto and the GTA

We work in Bay Street and King West towers, NYCC, Yonge-Sheppard and Yonge-Eglinton offices, Square One and Mississauga Executive Centre, Airport Corporate Centre in Etobicoke, VMC in Vaughan and Hwy 7 and Hwy 404 offices in Markham. Portfolio owners can combine office programs under our 

property manager programs

[/commercial-hvac-for-property-managers/ →](/commercial-hvac-for-property-managers/)

.

Services for Offices & Towers

## Equipment We Cover for Offices & Towers

![Chiller technicians working on a centrifugal chiller in a Toronto tower mechanical room](/images/misc/three-chiller-technicians-in-hard-hats-working-on-.webp)

[/commercial-chiller-service/ →](/commercial-chiller-service/)

### 

Commercial Chiller Service

[/commercial-chiller-service/ →](/commercial-chiller-service/)

$4,500-$450K

Chiller repair, rebuild and replacement for towers and institutions, 20-500 tons.

View service

[/commercial-chiller-service/ →](/commercial-chiller-service/)

![Technicians inspecting a cooling tower fan deck on a downtown Toronto roof](/images/misc/two-technicians-in-hard-hats-inspecting-the-fan-de.webp)

[/cooling-tower-service/ →](/cooling-tower-service/)

### 

Cooling Tower Service

[/cooling-tower-service/ →](/cooling-tower-service/)

$2,800-$45K

Tower repair, water treatment and legionella programs for open and closed loop towers.

View service

[/cooling-tower-service/ →](/cooling-tower-service/)

![Controls technicians wiring a building automation panel in a Toronto tower](/images/misc/two-controls-technicians-wiring-a-bacnet-building-.webp)

[/commercial-bms-controls/ →](/commercial-bms-controls/)

### 

Commercial BMS & HVAC Controls

[/commercial-bms-controls/ →](/commercial-bms-controls/)

$15K-$180K

BMS install, retrofit and programming for towers, institutions and industrial sites. $15K-$180K.

View service

[/commercial-bms-controls/ →](/commercial-bms-controls/)

![Technicians changing filters inside a rooftop unit during a quarterly maintenance visit](/images/misc/two-technicians-in-hard-hats-changing-filters-and-.webp)

[/commercial-hvac-maintenance/ →](/commercial-hvac-maintenance/)

### 

Commercial HVAC Maintenance

[/commercial-hvac-maintenance/ →](/commercial-hvac-maintenance/)

$185+/visit

PM contracts: quarterly, semi-annual or monthly, with a written condition report every visit.

View service

[/commercial-hvac-maintenance/ →](/commercial-hvac-maintenance/)

![Technicians servicing a restaurant make-up air unit next to kitchen exhaust fans](/images/misc/two-technicians-servicing-a-captive-aire-make-up-a.webp)

[/make-up-air-unit-service/ →](/make-up-air-unit-service/)

### 

Make-Up Air Unit Service

[/make-up-air-unit-service/ →](/make-up-air-unit-service/)

$185+ diag

MUA repair, maintenance and replacement for kitchens, industrial and parking garages.

View service

[/make-up-air-unit-service/ →](/make-up-air-unit-service/)

![Gas technicians repairing a condensing boiler in a Toronto commercial boiler room](/images/misc/two-tssa-gas-technicians-repairing-a-lochinvar-cre.webp)

[/commercial-boiler-repair/ →](/commercial-boiler-repair/)

### 

Commercial Boiler Repair

[/commercial-boiler-repair/ →](/commercial-boiler-repair/)

$185+ diag

Hydronic, steam, condensing and firetube boiler repair, 500-6,000 MBH. $650-$8,500.

View service

[/commercial-boiler-repair/ →](/commercial-boiler-repair/)

![Installers mounting a VRF ceiling cassette in a Toronto office fit-out](/images/misc/two-installers-on-a-scissor-lift-mounting-a-vrf-ce.webp)

[/commercial-ac-installation/ →](/commercial-ac-installation/)

### 

Commercial AC Installation

[/commercial-ac-installation/ →](/commercial-ac-installation/)

$14K-$220K

New AC installs for fit-outs, TIs, VRF builds and chilled water extensions. $14K-$220K.

View service

[/commercial-ac-installation/ →](/commercial-ac-installation/)

![Emergency technicians working on a rooftop unit at night in Toronto](/images/misc/two-emergency-hvac-technicians-with-headlamps-work.webp)

[/emergency-commercial-hvac-repair/ →](/emergency-commercial-hvac-repair/)

### 

24-Hour Emergency Commercial HVAC Repair

[/emergency-commercial-hvac-repair/ →](/emergency-commercial-hvac-repair/)

$185 surcharge

24-hour emergency dispatch across Toronto and the GTA with 2-4 hour response.

View service

[/emergency-commercial-hvac-repair/ →](/emergency-commercial-hvac-repair/)

Transparent Pricing

## How Much Does Commercial HVAC for Offices Cost in Toronto?

Plant Assessment

From $4,500

Chiller, tower and AHU condition assessment with written findings.

-   Tube and oil testing
-   BAS trend review
-   Rebuild vs replace options

Book This

[tel:+14375242997 →](tel:+14375242997)

Most Requested

Building PM Program

$18K-$85K/yr

Monthly or quarterly PM for plant, AHUs, VAV and controls.

-   4-hour tenant comfort SLA
-   Legionella records
-   Quarterly reporting

Book This

[tel:+14375242997 →](tel:+14375242997)

10-Year Chiller PM

Quoted

Long-term plant program with planned rebuilds.

-   Annual tube testing
-   Fixed escalation
-   Capital forecast

Book This

[tel:+14375242997 →](tel:+14375242997)

Office programs are priced by plant size, AHU and VAV count and SLA terms. Repair calls use standard rates: $185 diagnostic, waived on repairs over $750.

Why Us

## Why Choose Toronto Commercial HVAC for Offices & Towers?

### Plant and Floors Together

One team for chillers, towers, AHUs, VAV and BAS, so comfort problems are traced to the real cause.

### 4-Hour Tenant Comfort SLA

Tenant comfort calls answered on site within 4 hours under program agreements.

### 85+ Chiller Plants on PM

Including a 42-storey Bay Street plant that logged an 18% energy reduction after its 2024 rebuild.

### Legionella Programs

Cooling tower treatment, sampling and records per tower to support Ontario Reg 611 compliance.

### BAS People, Not Just Mechanics

Metasys, Desigo, Niagara and Delta programming, so the building automation actually runs the building.

### Handover Documentation

Section 44 style handover packages for new buildings: as-builts, commissioning and O&M data in one place.

## Repair or replace? Get the numbers first.

A $185 diagnostic gives you written findings per unit, waived when the approved repair is over $750.

(437) 524-2997

[tel:+14375242997 →](tel:+14375242997)

 

Request Service

[/contact/ →](/contact/)

Process

## How Does Our Offices & Towers Process Work?

1.  01
    
    ### Building Assessment
    
    Plant, AHUs, VAV, perimeter heat and BAS reviewed, with tenant ticket history.
    
2.  02
    
    ### Program and SLA
    
    PM scope, visit frequency and a 4-hour tenant comfort response SLA agreed in writing.
    
3.  03
    
    ### Plant Care
    
    Monthly chiller logs, tower water treatment, legionella sampling and annual testing.
    
4.  04
    
    ### Tenant Response
    
    Comfort tickets handled under SLA. Marco Russo, Chiller Specialist, owns plant and BAS performance.
    
5.  05
    
    ### Report and Plan
    
    Quarterly reports with ticket trends, plant performance and a capital forecast.
    

Field Photos

## Offices & Towers Work on Toronto Commercial Sites

 

Track Record

## Related Commercial Projects

All projects

[/projects/ →](/projects/)

![New make-up air unit being set on a North York office tower roof](/images/featured/new-make-up-air-unit-being-set-by-crane-on-a-north.webp)

[/projects/north-york-office-tower-mua-replacement/ →](/projects/north-york-office-tower-mua-replacement/)

North York $38,000

### 

North York Office Tower MUA Full Replacement

[/projects/north-york-office-tower-mua-replacement/ →](/projects/north-york-office-tower-mua-replacement/)

A failed 25-year-old make-up air unit replaced over one weekend, with the food court exhaust interlocks and building pressurization rebalanced.

Replacement 

Case study

[/projects/north-york-office-tower-mua-replacement/ →](/projects/north-york-office-tower-mua-replacement/)

Client Feedback

## What Clients Say About Our Offices & Towers

5-Star Commercial Satisfaction

> "Tenant comfort tickets dropped by half in the first year, and the quarterly report is now part of our owner package."

Geoffrey Tan

General Manager, 32-storey A-class office tower

Downtown Toronto

Monthly plant PM, tower legionella program and 4-hour comfort SLA$82,000 annual

> "Half our VAV boxes were not doing anything. After the retrofit and new schedules, the floor temperatures finally match the setpoints."

Diane Leclerc

Property Manager, B-class office building, 9 floors

North York

VAV actuator retrofit and BAS schedule clean-up$34,500

> "The assessment gave us a rebuild schedule for both chillers over ten years. For once, the capital plan matches the plant."

Samir Aziz

Chief Engineer, Suburban office campus, 3 buildings

Etobicoke

Chiller plant assessment and 10-year PM program$58,000 annual

Straight Answers

## Offices & Towers FAQs

### What does an office tower HVAC program include?

+

A full office program usually covers the central plant (chillers, cooling towers, boilers and pumps), air handling units, VAV boxes and perimeter heating, building automation, and tenant comfort response. We run monthly or quarterly PM depending on the system, keep chiller logs and cooling tower water treatment and legionella records, tune VAV and BAS settings, and answer tenant comfort calls under a 4-hour SLA. Quarterly reports cover ticket trends, plant performance and a capital forecast so the property team can plan rebuilds and replacements years ahead instead of reacting to failures.

### What is a tenant comfort SLA?

+

A written commitment to respond to tenant hot and cold calls within a set time. Our office programs include a 4-hour on-site response for comfort calls during business hours.

### Do you service A-class and B-class buildings?

+

Yes. A-class towers with central plants and full BAS, and B-class buildings with RTUs, older boilers and simpler controls.

### How do you handle cooling tower legionella requirements?

+

Treatment, sampling and cleaning programs with records kept per tower, supporting Ontario Reg 611 compliance.

### Can you fix chronic hot and cold complaints?

+

Usually. Most chronic complaints come from failed VAV actuators, bad sensors, poor schedules or air balance. We trend the zones, fix the hardware and retune the controls.

### Do you offer long-term chiller programs?

+

Yes. 10-year chiller PM programs with annual tube testing, oil analysis and planned rebuilds.

### What is Section 44 handover documentation?

+

For new buildings and major retrofits, we assemble as-built drawings, commissioning reports, equipment data and O&M manuals into a handover package for the owner and operator.

### Do you work after hours in occupied towers?

+

Yes. Noisy or disruptive work is scheduled evenings and weekends, and we follow building security and access procedures.

### Can you take over BAS support from the original controls contractor?

+

In many cases yes, depending on platform and licensing. We support Johnson Controls Metasys, Siemens Desigo, Honeywell Niagara and Delta Controls.

### What does a plant assessment cost?

+

Chiller plant assessments start at about $4,500 and include testing and a written report with options.

Keep Exploring

## Related Services

![Chiller technicians working on a centrifugal chiller in a Toronto tower mechanical room](/images/misc/three-chiller-technicians-in-hard-hats-working-on-.webp)

[/commercial-chiller-service/ →](/commercial-chiller-service/)

### 

Commercial Chiller Service

[/commercial-chiller-service/ →](/commercial-chiller-service/)

$4,500-$450K

Chiller repair, rebuild and replacement for towers and institutions, 20-500 tons.

View service

[/commercial-chiller-service/ →](/commercial-chiller-service/)

![Technicians inspecting a cooling tower fan deck on a downtown Toronto roof](/images/misc/two-technicians-in-hard-hats-inspecting-the-fan-de.webp)

[/cooling-tower-service/ →](/cooling-tower-service/)

### 

Cooling Tower Service

[/cooling-tower-service/ →](/cooling-tower-service/)

$2,800-$45K

Tower repair, water treatment and legionella programs for open and closed loop towers.

View service

[/cooling-tower-service/ →](/cooling-tower-service/)

![Controls technicians wiring a building automation panel in a Toronto tower](/images/misc/two-controls-technicians-wiring-a-bacnet-building-.webp)

[/commercial-bms-controls/ →](/commercial-bms-controls/)

### 

Commercial BMS & HVAC Controls

[/commercial-bms-controls/ →](/commercial-bms-controls/)

$15K-$180K

BMS install, retrofit and programming for towers, institutions and industrial sites. $15K-$180K.

View service

[/commercial-bms-controls/ →](/commercial-bms-controls/)

![Technicians changing filters inside a rooftop unit during a quarterly maintenance visit](/images/misc/two-technicians-in-hard-hats-changing-filters-and-.webp)

[/commercial-hvac-maintenance/ →](/commercial-hvac-maintenance/)

### 

Commercial HVAC Maintenance

[/commercial-hvac-maintenance/ →](/commercial-hvac-maintenance/)

$185+/visit

PM contracts: quarterly, semi-annual or monthly, with a written condition report every visit.

View service

[/commercial-hvac-maintenance/ →](/commercial-hvac-maintenance/)

![](/images/misc/two-commercial-hvac-technicians-in-hard-hats-walki.webp)

24-Hour Commercial Emergency Dispatch

## Ready to Book Offices & Towers?

Commercial HVAC for Offices across Toronto and the GTA: $4,500+ assess, written findings before any work, and a 2-4 hour emergency response.

Call (437) 524-2997

[tel:+14375242997 →](tel:+14375242997)

 

Request Service

[/contact/ →](/contact/)

-   TSSA G1+G2, ESA, 313A
-   Written findings every visit
-   90-day / 2-year labour warranty