Solution
HVAC & Chilled-Water Tenant Billing
BTU Plus Billing System.
HVAC tenant billing, or BTU billing, charges each tenant of a central chilled-water system for the cooling energy they consume, calculated from chilled-water flow and supply/return ΔT, instead of by floor area or a flat rate. Tech OVN's Titan Plus BTU meters thermal energy (designed to EN 1434 Class 2) and electrical energy at Class 0.5S on one DIN-rail device.
Bill tenants for the cooling they actually consume. When a mall, office tower, tech park, or hospital runs central chilled water, flat-rate and area-based charges are inaccurate and dispute-prone — heavy users get subsidised by light ones. BTU Plus billing puts a Titan Plus BTU meter on each tenant, AHU, or floor and turns metered cooling energy into automated, itemised, dispute-resistant bills.
Why Flat and Area-Based Cooling Charges Cause Disputes
In most buildings with central HVAC, tenants are charged for cooling by floor area or a flat monthly rate. Neither reflects what a tenant actually consumed. A 24×7 data-heavy office, a restaurant with a busy kitchen, and a lightly-occupied showroom on the same floor plate all pay the same per square foot — even though their cooling loads differ enormously.
The result is structural unfairness: light users subsidise heavy users, the operator cannot recover the true central-plant cost, and every billing cycle invites a dispute nobody can resolve because there is no measurement to point to. There is also no way to see which tenant is wasting cooling, because the plant bill is one lump sum.
BTU Plus billing replaces the formula with a meter. Every tenant pays for the cooling they actually used — and the bill reconciles to the meter.
How BTU Plus Billing Works
Measure the cooling energy each tenant draws, then turn it into an automated itemised bill — thermal and electrical, on one device.
Measure the Cooling
Thermal (designed to EN 1434)
Titan Plus BTU measures chilled-water flow and the supply/return temperature difference (ΔT) on each tenant, AHU, or floor connection, and computes cooling energy in TR-hr / kWh-thermal with a calculation designed to EN 1434 — the thermal energy the tenant consumed.
Measure the Electrical
Class 0.5S kWh
The same device meters electrical energy — tenant supply, AHU, or pump load — at Class 0.5S, designed to IEC 62053-22. Cooling and electricity on one meter, one connection point, one data stream.
Bill Automatically
Itemised Tenant Invoices
The Energy Intelligence Platform reads each meter's registers, applies your tariff, and generates monthly, itemised, dispute-resistant bills automatically — each reconciling back to the meter, with a role-restricted dashboard per tenant.
What BTU Plus Billing Delivers
Seven capabilities that make metered cooling billing fair, automated, and defensible.
Thermal Metering Designed to EN 1434
Cooling energy is measured the way it is actually delivered — chilled-water flow multiplied by supply/return ΔT, with the calculation designed to EN 1434 Class 2 and dual PT1000 RTD probes. Measured, not estimated.
Per-Tenant / Per-AHU Allocation
One meter per tenant connection, air-handling unit, or floor. Every zone gets its own thermal and electrical registers, so cooling cost lands on whoever consumed it.
Tamper-Evident Billing Data
Sealed registers, tamper detection, and timestamped readings on the same device. When a tenant queries a bill, there is a measured record to point to.
Automated Itemised Invoices
The Energy Intelligence Platform turns metered TR-hr and kWh-thermal into monthly, itemised tenant bills automatically — no manual meter walks, no spreadsheet reconciliation.
Multi-Tenant Dashboard
Property managers see the whole building; each tenant sees only their own cooling consumption, cost, and trend. Role-based access keeps tenant data separate.
Dispute-Resistant Audit Trail
Every reading is logged with a timestamp and retained. Billing periods reconcile to the meter, so cooling-charge disputes are settled by data instead of negotiation.
Combined Electrical + Thermal on One Device
Titan Plus BTU meters chilled-water thermal energy and electrical energy on a single DIN-rail unit — bill the cooling, monitor the pump/AHU electrical load, one device per point.
What You Measure & Bill
The billing registers Titan Plus BTU captures on every tenant, AHU, or floor connection.
Metered for billing
| Parameter | Specification |
|---|---|
| Thermal energy | kWh-thermal / TR-hr (tons of refrigeration-hours) per tenant |
| Cooling load | Instantaneous TR (tons of refrigeration) and kW-thermal |
| Chilled-water flow | m³/h and cumulative volume, via external ultrasonic or electromagnetic flow meter |
| Supply / return temperature | Dual PT1000 RTD probes, live supply, return, and ΔT |
| Thermal calculation | Designed to EN 1434 Class 2 (flow × ΔT), temperature-compensated water properties (IAPWS-IF97) |
| Electrical energy | kWh, kVAh, demand — Class 0.5S, designed to IEC 62053-22, for pumps / AHUs / tenant supply |
| Per-tenant registers | Independent billing registers per tenant / AHU / floor, sealed and timestamped |
| Billing period data | Interval load profile with configurable billing cycles for automated invoicing |
Thermal standard
The cooling-energy calculation is designed to EN 1434 Class 2 — the European standard for thermal energy meters — with dual PT1000 RTD probes. EN 1434 limits depend on flow rate and ΔT, so installed accuracy also depends on the flow meter and how the loop runs.
Where It Fits
Six building types running central cooling where metered tenant billing ends the dispute.
Malls & Retail
Bill each store for the chilled water it draws instead of dividing the central plant bill by floor area. Heavy-cooling F&B units stop being subsidised by low-load retail.
Office Towers & Business Parks
Per-tenant, per-floor cooling allocation for multi-tenant offices. Fair recovery of central HVAC cost, with consumption transparency for ESG-conscious occupiers.
Tech & IT Parks
High, uneven cooling loads across occupiers with different operating hours. Meter each tenant connection so 24×7 operations pay for their real share.
Hospitals
Central chilled water serving departments, diagnostics, and leased spaces (pharmacy, cafeteria, labs). Allocate cooling cost per department or per licensee accurately.
Hotels & Mixed-Use
Separate cooling billing for retail podium, banquet, serviced apartments, and commercial tenants running off one central plant on different tariffs.
District Cooling Networks
Per-connection chilled-water billing for scheme operators supplying multiple buildings. Auditable TR-hr consumption on every service point.
BTU Billing vs Flat-Rate vs Area-Based
The three ways central cooling gets charged to tenants — and why metering is the one that ties the bill to consumption.
| Billing basis | BTU Plus (metered) | Flat-rate charge | Area-based (per sq ft) |
|---|---|---|---|
| Reflects actual cooling used | Yes — measured TR-hr per tenant | No — everyone pays the same | No — proxy for consumption |
| Fairness across tenants | High — pay for what you use | Low — light users subsidise heavy | Low — occupancy ≠ cooling load |
| Billing accuracy | Metered — designed to EN 1434 Class 2 | None — flat assumption | Rough — sq ft formula only |
| Dispute risk | Low — meter-backed audit trail | High — perceived unfairness | High — contested allocations |
| Waste visibility | Yes — per-tenant trends surface waste | None | None |
| Metering cost | One meter per connection point | Zero — but revenue leaks | Zero — but disputes cost more |
| Recovers central plant cost fairly | Yes — matched to consumption | Partly — misallocated | Partly — misallocated |
Frequently Asked Questions
Seven common questions on BTU billing meters, EN 1434 accuracy, retrofits, flow-sensor choice, and BMS integration.
Related products & solutions
The BTU Plus billing stack — the combined meter, the thermal meter, and the adjacent cooling and electricity use cases.
Titan Plus BTU — Combined Meter
Electrical + thermal metering (designed to EN 1434) on one DIN-rail device. The meter behind BTU Plus billing — cooling and electricity per point.
Learn More →Titan BTU — Thermal Energy Meter
Dedicated chilled-water / hot-water BTU meter for thermal-only tenant billing where electrical metering isn't needed.
Learn More →District Cooling Monitoring
Chiller-plant COP, kW/TR, predictive maintenance, and per-connection BTU billing for district cooling networks.
Learn More →Commercial Sub-Metering (Electricity)
The electricity counterpart — per-tenant, per-floor electrical sub-billing on Titan meters. One platform, both energy types.
Learn More →What HVAC Billing Costs
Priced per measurement point, so a pilot can be a single tenant loop.
| Parameter | Specification |
|---|---|
| Cost per measurement point | ₹17,400 per Titan BTU thermal meter, or ₹11,000 + GST per Titan electrical meter — one per tenant loop or chiller. |
| MOQ — catalogue | None. A pilot or an evaluation order can be one unit. |
| Lead time | Regular orders ship from stock; orders of 200 units or more take 4 weeks. |
| Warranty | 2 years standard from date of dispatch. |
| Per-site infrastructure | None. WiFi and Ethernet are built into the meter — no energy-server PC, data concentrator or per-site software licence. |
| Cloud dependency | None required. Modbus RTU/TCP and BACnet (MS/TP or IP) are local and work with no internet connection; the Tech OVN platform is optional. Note: automated invoicing runs on the platform. |
Ready to bill tenants for the cooling they actually use?
Talk to our team about BTU Plus billing for your mall, office tower, tech park, hospital, or district cooling scheme — fair, automated, dispute-resistant.