# 3 Ton Rooftop Unit Toronto | Rooftop Units Toronto Pros

> 3 ton rooftop unit Toronto for small retail and dental suites. 3-5 ton installed $9,500-$16K, 3-5 days. Red Seal crew. 24-hour written quote.

URL: https://rooftopunitstoronto.ca/3-ton-rooftop-unit-toronto/

![Compact 3-ton packaged rooftop unit above a small commercial suite](/images/misc/compact-3-ton-packaged-rooftop-unit-on-a-small-com.webp)

Small Retail + Dental Suites

# 3-Ton Rooftop Units for Small Retail and Dental Suites

Last updated: October 24, 2026

Right-sized 3-ton RTUs for small retail, dental and medical suites.

-   Operatory will not hold temperature
-   Oversized unit short cycling
-   Humidity swings
-   Noisy small RTU
-   Failing original unit

Book a Site Assessment

[/contact/ →](/contact/)

 

View Pricing

[#pricing →](#pricing)

24-Hour Written Quote

From $9,500 installed, 3-5 ton

-   Parts, labour, crane, permit + HST on one line
-   2-4 hr on-roof emergency response, GTA core
-   Save on Energy rebate filed on qualifying work

Red Seal HVAC-RTSSA G1 + G2ESA + CRE$5M + WSIB

24/7 Dispatch (437) TBD

[tel:+14370000000 →](tel:+14370000000)

-   24-Hour Written Quote (not a sales pitch)
-   24/7 Emergency RTU Dispatch (2-4 hr on-roof GTA core)
-   Red Seal HVAC-R + TSSA + ESA + CRE Chiller
-   $5M Liability + WSIB + COI in 24 Hours
-   Save on Energy Rebate Filed on Your Behalf

1,800+

GTA installs

97%

Uptime

2-4 hr

On-roof, GTA core

48

Sites under contract

Symptoms first

## Is Your Equipment Showing These Signs?

A dental operatory that will not hold temperature or a small retail unit with an oversized, short-cycling RTU: 3-ton units fit small footprints. Installed 3-5 ton $9,500-$16K in 3-5 days.

-   Operatory will not hold temperature
-   Oversized unit short cycling
-   Humidity swings
-   Noisy small RTU
-   Failing original unit

Seeing one of these? 

Book a site assessment

[/contact/ →](/contact/)

 or call dispatch for a 2-4 hour on-roof visit in the GTA core.

## Small Suites With Big Comfort Problems

A 3-ton rooftop unit is the right tool for a small commercial space, but only when it is the right size. The calls we get from small suites usually fall into two groups. Dental operatories and clinic rooms that will not hold steady temperature or humidity. And small retail units where someone installed an oversized RTU that **short cycles**, leaving the space clammy and the compressor wearing out early.

A **3-ton RTU** delivers about **36,000 BTU** of cooling. That suits many small storefronts, dental suites, medical offices and service businesses, once the actual load is checked.

## Fit by Use

| Building use | Why 3 tons often fits | What changes the math |
| --- | --- | --- |
| Dental or medical suite | Small floor area, steady occupancy | Equipment heat, sterilization rooms, filtration |
| Small retail storefront | Modest floor area | West-facing glass, door traffic |
| Small office or service business | Few occupants | Server closet, kitchenette |

We confirm with a **Manual J** load calculation, not a square-foot rule. When the load comes in higher, a 

5-ton rooftop unit

[/5-ton-rooftop-unit-toronto/ →](/5-ton-rooftop-unit-toronto/)

 may be the better fit.

## Clinics and the Dental Operatory

A **dental operatory** needs quiet, steady temperature and clean air. That means a unit sized to the load (so it runs longer, gentler cycles), **MERV 13** filtration where the blower can handle it, and an install scheduled after hours. On our Davisville dental clinic project, the right-sized unit and after-hours install meant no lost patient day.

## How Much Does a 3-Ton RTU Cost?

3-5 ton units run **$9,500-$16K installed**, typically in **3-5 business days**. That includes crane, curb check, gas and electrical connections and commissioning on standard roofs. Curb adapters and permits are listed separately if needed. Brands include Lennox, Carrier, York, Trane, Daikin, Rheem and American Standard.

## Quick Answers

**Is a smaller unit always cheaper to run?** A right-sized unit is cheaper to run than an oversized one, because it short cycles less and controls humidity better.

**Can a 3-ton unit replace an old 5-ton?** Sometimes. Many small suites were fitted with oversized units years ago. If the load calculation says 3 tons, going smaller saves capex and hydro.

For installation details see 

commercial rooftop unit installation

[/commercial-rooftop-unit-installation-toronto/ →](/commercial-rooftop-unit-installation-toronto/)

, and for model options see 

packaged rooftop units

[/packaged-rooftop-unit-toronto/ →](/packaged-rooftop-unit-toronto/)

. We install small RTUs across 

North York

[/service-areas/north-york/ →](/service-areas/north-york/)

, Davisville, Leaside and the GTA, alongside the rest of our 

Toronto commercial rooftop units

[/ →](/)

.

Published pricing

## How Much Does 3-Ton RTU Cost in Toronto?

Ranges from recent GTA jobs. Your written quote lands within 24 hours with parts, labour, crane, permit and HST on one line, and rebate-net pricing where the work qualifies.

25/50/25 payment on installs: 25% at order, 50% on install day, 25% on commissioning sign-off. Net-30 for commercial and PM accounts. 

See all pricing

[/pricing/ →](/pricing/)

.

### 3-Ton RTU pricing

CAD + HST

| Service | Price | Timeline |
| --- | --- | --- |
| 3-5 ton RTU installed | $9,500-$16K | 3-5 days |
| RTU diagnostic (business hr) | $275-$425 | Same day |
| Annual RTU maintenance | $295-$450/unit/yr | Quarterly |

Free tools

## Try Our Free Commercial RTU Sizing Calculator

Two minutes, no email required. Results show on screen first.

### Commercial RTU Sizing Calculator

Estimate the cooling tonnage a commercial space needs, then see which rooftop unit size and installed price range to ask about.

Use the calculator

[Commercial RTU Sizing Calculator →](/tools/btu-calculator/)

Case study | Davisville, Toronto | Yonge and Davisville

## Davisville dental clinic HVAC

A dental clinic needed quiet, steady temperature in its operatories. The old unit was oversized for the suite and short cycled, leaving rooms clammy. We sized a right-sized unit with Manual J, upgraded filtration and scheduled the install after hours so the clinic did not lose a patient day.

Equipment

Small packaged RTU with MERV 13 filtration

Size

Dental suite

Turnaround

After-hours install

Price

Within $9,500-$16K range

Why property teams pick us

## Why Choose Rooftop Units Toronto Pros for 3-Ton RTU?

### Sized for small spaces

Manual J sizing stops the oversized-unit short cycling that plagues small suites.

### After-hours installs

Clinic installs scheduled after hours so no patient day is lost.

### MERV 13 ready

Filtration upgraded for infection control, with airflow verified.

### Fast timeline

3-5 business days from signed quote to startup on most small units.

Field photos

## Our 3-Ton RTU Work

Recent GTA rooftops and mechanical rooms. Click any photo to enlarge.

### Before + After

![Oversized short-cycling RTU on a small retail roof](/images/cards/oversized-short-cycling-rooftop-unit-on-a-small-re.webp)

Before

![Right-sized 3-ton packaged RTU on the same roof](/images/cards/right-sized-3-ton-packaged-rooftop-unit-running-st.webp)

After

Davisville dental clinic HVAC: sized properly and installed after hours.

Client Records

## What Clients Say About Our 3-Ton RTU

> "Our dental clinic needed quiet, steady temperature in the operatories. They sized the unit properly and scheduled the install after hours so we did not lose a patient day."

DLDr. Lena M.Clinic owner, Davisville

> "No heat at 6am with a full patient list. A tech was on the roof before 9 and the flame sensor was replaced before our first appointment ran late."

DSDr. Sam W.Dental clinic, Leaside

> "Short cycling RTU over our North York clinic, fixed after hours so patients were not affected. Readings and photos came with the invoice."

FAFarah A.Clinic manager, North York

> "Our small shop finally holds temperature. The new unit is smaller than the old one and works better."

JPJoanne P.Boutique owner, Leslieville

> "We get a written tally every time before any work starts. That alone made them our only rooftop contractor for three plazas on The Queensway."

CNChris N.Facility coordinator, Etobicoke

## RTU offline or chiller alarm?

Red Seal tech on the roof in 2-4 hrs across the GTA core. Call (437) TBD.

(437) TBD

[tel:+14370000000 →](tel:+14370000000)

 

Emergency Service

[/emergency-rooftop-unit-repair-toronto/ →](/emergency-rooftop-unit-repair-toronto/)

Buyer questions

## 3-Ton RTU FAQs

Still have a question?

A Red Seal lead answers, not a call centre. Written quote within 24 hours.

Book a Site Assessment

[/contact/ →](/contact/)

(437) TBD

[tel:+14370000000 →](tel:+14370000000)

### How much does a 3-ton rooftop unit cost installed in Toronto?

3-5 ton RTUs run $9,500-$16K installed, including crane, curb check, connections and commissioning on standard roofs. Most are installed in 3-5 business days.

### Is 3 tons enough for my space?

A 3-ton unit delivers about 36,000 BTU of cooling, which suits many small retail units, dental suites and clinics. The right size depends on glazing, people, equipment and ventilation, so we confirm with a Manual J calculation.

### Why does an oversized unit cause problems?

An oversized unit cools the space too fast and shuts off before it removes humidity. That is short cycling: clammy rooms, temperature swings and faster wear on the compressor and contactors.

### Can you install after hours at our clinic?

Yes. Clinic and retail installs are scheduled for evenings or weekends so you do not lose a day of patients or sales.

### What filtration do you recommend for dental and medical suites?

MERV 13 where the unit's blower can handle the pressure drop, with airflow and static pressure verified after the upgrade.

### How long does a 3-ton RTU last?

15-20 years on a Toronto roof with quarterly maintenance.

### Which brands make 3-ton commercial RTUs?

Lennox, Carrier, York, Trane, Daikin, Rheem and American Standard all offer 3-ton packaged units, and we are authorized for each.

### Do small RTUs qualify for rebates?

High-efficiency units can qualify for Save on Energy rebates per ton. On small units the dollar amount is smaller, but we still file where it applies.

Keep the whole roof covered

## Related Services

 

![5-ton RTU beside a kitchen exhaust fan and make-up air unit on a restaurant roof](/images/misc/5-ton-packaged-rooftop-unit-next-to-a-kitchen-exha.webp) From $9,500

[/5-ton-rooftop-unit-toronto/ →](/5-ton-rooftop-unit-toronto/)

### 

5-Ton Rooftop Units

[/5-ton-rooftop-unit-toronto/ →](/5-ton-rooftop-unit-toronto/)

5-ton RTUs for restaurants and small offices, sized for kitchen and occupancy loads.

Details + pricing

[/5-ton-rooftop-unit-toronto/ →](/5-ton-rooftop-unit-toronto/)

 

![Packaged rooftop unit with economizer hood on a Toronto office roof](/images/misc/single-cabinet-packaged-rooftop-unit-with-economiz.webp) From $9,500

[/packaged-rooftop-unit-toronto/ →](/packaged-rooftop-unit-toronto/)

### 

Packaged Rooftop Units

[/packaged-rooftop-unit-toronto/ →](/packaged-rooftop-unit-toronto/)

Gas/electric and heat pump packaged units from authorized brands, sized to the roof and the load.

Details + pricing

[/packaged-rooftop-unit-toronto/ →](/packaged-rooftop-unit-toronto/)

 

![Crane lowering a new packaged rooftop unit onto a roof curb in Toronto](/images/misc/mobile-crane-lowering-a-new-packaged-rooftop-unit-.webp) From $9,500

[/commercial-rooftop-unit-installation-toronto/ →](/commercial-rooftop-unit-installation-toronto/)

### 

Commercial Rooftop Unit Installation

[/commercial-rooftop-unit-installation-toronto/ →](/commercial-rooftop-unit-installation-toronto/)

New and added-capacity RTU installs sized with Manual J/S, crane coordinated, commissioned and signed off.

Details + pricing

[/commercial-rooftop-unit-installation-toronto/ →](/commercial-rooftop-unit-installation-toronto/)

## Don't See Your GTA City?

Coverage from Toronto to Pearson, Mississauga to Markham. Call 

(437) TBD

[tel:+14370000000 →](tel:+14370000000)

 for a 24-hour written quote.

All Service Areas

[/service-areas/ →](/service-areas/)

 

Get a Written Quote

[/contact/ →](/contact/)

![Packaged rooftop units on a Toronto commercial roof at dusk](/images/misc/toronto-commercial-rooftop-at-dusk-with-a-row-of-p.webp)

24/7 dispatch | 2-4 hr on-roof GTA core

## Ready to Book 3-Ton RTU?

Site assessment, then a written quote within 24 hours. Parts, labour, crane, permit and HST on one line.

Book a Site Assessment

[/contact/ →](/contact/)

 

Call (437) TBD

[tel:+14370000000 →](tel:+14370000000)

-   24-hour written quote
-   Save on Energy filed for you
-   Red Seal + TSSA + ESA + CRE
-   $5M liability + WSIB