ThornburyMechanical Systems
A row of rooftop cooling units lined up along the top of a commercial building

Commercial HVAC for Class-A property

Protecting the comfort, efficiency, and lifespan of critical building systems.

We keep chillers, air handlers and boilers running for property managers who cannot afford a summer outage — through scheduled service, measured performance, and reporting a board can read.

Request a walkthrough(617) 555-0188

Licensed & insured · EPA 608 · NATE-certified technicians

SERVICE PROFILE

Response
≤ 4 HRS
Coverage
24/7/365
Operating since
1998

The Thornbury standard

Most contractors wait for the call.We keep the call from happening.

A rooftop unit rarely fails without warning. It drifts — a fouled coil, a slipping belt, a refrigerant charge two pounds light — and the drift is invisible on a comfort complaint but obvious on a gauge. Scheduled service finds it at the gauge, months before it becomes an emergency replacement quoted in July.

A technician on a mobile scaffold inspecting ventilation ductwork in the ceiling of a large commercial building

Reactive service

  • Called out once comfort complaints arrive
  • Repairs priced at emergency rates, in season
  • Equipment replaced at the end of a short life
  • No record of what changed, or when
THE THORNBURY STANDARD

Planned maintenance

  • Scheduled visits against a written scope
  • Readings logged and trended every visit
  • Equipment life extended by 3 to 5 years
  • Quarterly reporting your board can read
Years under service contract
27Years under service contract
Buildings maintained
410Buildings maintained
Sq ft under contract
3.8MSq ft under contract
Emergency response
≤ 4hEmergency response

Specialised systems

Engineered for buildings that cannot go down

Six disciplines, one service contract, one point of contact. Every visit ends with readings logged against the asset, not a signature on a docket.

Industrial cooling plant machinery and large pipes standing against a modern glass office buildingCHW

Chilled water & cooling plant

Centrifugal and screw chillers, cooling towers, pumps and chemical treatment. Approach temperatures trended so a fouling condenser shows up as a number before it shows up as a complaint.

Rooftop condenser units with exposed fans and connecting pipeworkRTU

Rooftop units & air handlers

Packaged rooftop units, AHUs and split systems. Coils cleaned, belts and bearings replaced on schedule, economisers proven to actually modulate rather than sit stuck open.

A boiler room with heating pipework, a pressure gauge, a red isolation valve and a circulator pumpBLR

Boilers & hydronic heating

Condensing and cast-iron boilers, circulators, expansion and water treatment. Combustion analysed and logged each season, because an untuned burner spends money quietly all winter.

Large spiral ventilation ductwork branching across the exposed ceiling of a terminal buildingVAV

Ductwork, VAV & air balancing

Terminal units, dampers and distribution. We balance to the design drawing where one exists, and produce one where it doesn't — which is how most hot-and-cold-call disputes actually end.

A technician in a dust mask removing the filter panel from a wall-mounted air conditioning unitIAQ

Filtration & indoor air quality

Filter programmes matched to occupancy, coil hygiene, and ventilation rates verified against the standard your building is actually held to — not the one on the original spec sheet.

Gloved hands testing wiring inside a building control panel with a probeBAS

Controls & building automation

Sensors calibrated, schedules audited, overrides found and removed. Most buildings we inherit are running a setpoint someone changed years ago and nobody has looked at since.

Maintenance programs

A program for every property standard

Three levels of cover, priced against your plant list rather than your square footage. Move between them at any renewal.

Essential Coverage

For stable buildings that need a dependable baseline.

Program spec

Visits / yr
2
Response
NEXT DAY
Reporting
ANNUAL
  • Seasonal changeover inspections
  • Filter and belt replacement
  • Coil cleaning on primary equipment
  • Readings logged against each asset
  • Priority over non-contract callouts
Schedule assessment
Most chosen

Priority Care

For occupied commercial property where downtime is visible.

Program spec

Visits / yr
4
Response
≤ 4 HRS
Reporting
QUARTERLY
  • Everything in Essential Coverage
  • Quarterly service across all plant
  • 24/7 emergency response, capped at four hours
  • Combustion and refrigerant analysis logged
  • Controls audit and setpoint review
  • Named account engineer on every visit
  • Quarterly report written for management
Schedule assessment

Total Stewardship

For flagship assets and buildings under compliance scrutiny.

Program spec

Visits / yr
12
Response
≤ 2 HRS
Reporting
MONTHLY
  • Everything in Priority Care
  • Monthly attendance and plant-room checks
  • Two-hour emergency response, contracted
  • Full asset register and condition grading
  • Capital replacement forecast, updated yearly
  • Energy and compliance reporting pack
  • Board-ready annual review presented in person
Schedule assessment

Every program is quoted after a walkthrough. We do not price a building we have not stood in.

An upscale commercial elevator lobby with marble walls and floor lit by recessed linear lighting

Trusted

What property managers say

We inherited a building with eleven years of deferred service and no asset register. Thornbury built one in a fortnight, graded every unit, and told us plainly which two we would be replacing. Nothing has failed in service since.
Alana ReyesPortfolio Manager · Two Harbor Square
The quarterly report is the thing. I forward it to the board unedited — it is written for them, not for an engineer, and it has ended the argument about whether the spend is doing anything.
Devin OkaforDirector of Facilities · Brightwater Medical
A chiller went down on the hottest weekend of the year. Someone answered, someone was on the roof inside three hours, and residents never knew. That is the whole reason we pay for the contract.
Marta KesslerGeneral Manager · The Ellsworth Residences
  • Licensed & insured
  • EPA 608 certified
  • NATE-certified technicians
  • Factory-authorised service
  • 24/7 emergency response

Frequently asked

Questions property managers ask us

A walkthrough, an asset register, and a start date. We survey every piece of plant, grade its condition, and hand you the register whether or not you sign — it is yours either way. Most transitions complete inside three weeks and we coordinate directly with the outgoing contractor so nothing lapses.

Complimentary assessment

Stop guessing about the condition of your plant.

A 90-minute walkthrough of your mechanical spaces with a senior engineer. You leave with a graded asset register and a written summary — no cost, no obligation, and yours to keep whichever way you go.

Request a walkthrough(617) 555-0188

What is included

  • Chiller and cooling plant condition assessment
  • Rooftop unit and air handler survey
  • Boiler and combustion review
  • Filtration and ventilation check
  • Controls and setpoint audit
  • Graded asset register with replacement forecast

WALKTHROUGH

Duration
90 MIN
Attends
SR ENGINEER
Cost
NONE