Top 10 TM44 Fixes That Cut Your Energy Bills by 25%+ in 2026

TM44.uk: Top 10 TM44 Fixes That Can Cut Your Energy Bills by 25% or More in 2026

Why TM44 Inspections Are Your 2026 Energy-Saving Superpower

Air conditioning is one of the biggest energy costs inside UK commercial buildings. Offices, retail units, hotels and warehouses can easily spend up to 40% of their electricity bill just on cooling. With energy prices staying stubbornly high, this cost is not going away on its own.

The part most building owners never see is how much of that spend is pure waste. A proper TM44 inspection does more than tick a compliance box. It highlights oversized systems, control issues, poor maintenance and building leaks that are quietly burning through your budget.

When those issues are fixed, it is common to see cooling costs drop by 25-35%, often without major disruption or full system replacement. With enforcement tightening in 2026 and fines of £800 per non-compliant building on the table, using TM44 as a tool for savings rather than a last minute obligation is the smart move.

At TM44.uk, our accredited assessors work across hundreds of buildings nationwide. We see the same problems again and again, which means we also know exactly where the biggest opportunities are.

A National Opportunity: 80% Of Buildings Still Are Not TM44 Compliant

TM44 applies to any building with more than 12 kW of combined cooling capacity. Across the UK, that covers an estimated 300,000 properties. Only around 20% of those currently comply.

That means three things:

• Most buildings are running AC systems that have never been seriously reviewed for efficiency.
• Owners are paying more for energy than they need to, year after year.
• Many sites are exposed to enforcement action as TM44 checks ramp up from 2026.

For the buildings that do go through a proper TM44 inspection and act on the recommendations, the story is very different. Even implementing just a handful of the highest impact fixes can reduce cooling energy use by 25-35%.

When you combine TM44 with wider aims like MEES, EPC improvement and Net Zero, you are no longer just “staying legal”. You are actively improving asset performance and reducing operating costs.

Not sure if your building falls under the regulations yet? You can check quickly here:

➡️ Do I Need a TM44 Inspection?

The Top 10 TM44 Fixes With Realistic Savings and ROI

The examples below are based on a typical scenario: a 500 m² office with a 50 kW AC load, running 2,000 hours per year at an electricity cost of 15p per kWh. That gives a baseline cooling cost of around £15,000 per year.

Your building will be different, but the patterns are the same. These are the fixes that consistently deliver the biggest wins.

Fix 1: Right-Size Your AC System

Oversized systems are one of the most common findings in TM44 inspections. When a unit is too powerful for the space, it short-cycles, wastes energy and fails to cool evenly. You end up paying more for poorer performance.

The solution is to recalculate the cooling load and either replace the system or reconfigure the setup to match the demand more closely.

• Typical saving: around £3,750 per year
• Payback: roughly 1.1 years

More about how TM44 assesses AC systems: ➡️ TM44 Air Conditioning Inspection

Fix 2: Upgrade Your Controls and Zoning

Poor controls are a silent drain on energy budgets. We frequently see thermostats set too low, heating and cooling running at the same time, and meeting rooms being cooled when they are empty.

Upgrading to modern controls, adding proper zoning and setting sensible schedules removes that waste quickly. It often does not require any major plant replacement.

• Typical saving: around £2,250 per year
• Payback: often under one year

If you want a more detailed improvement plan following your TM44, this helps: ➡️ Energy Efficiency Upgrade Report

Fix 3: Seal Your Ductwork

In many older buildings, 20-30% of cooled air is lost through leaky ducts before it ever reaches the occupied areas. From an energy perspective, that is like paying for cooling and then throwing a quarter of it away.

Pressure testing, sealing joints and insulating exposed duct runs is relatively inexpensive and delivers very fast payback.

• Typical saving: around £3,000 per year
• Payback: often within five months

Fix 4: Install High-Efficiency Inverter Units

Older fixed-speed AC units use a lot of electricity for the cooling they provide. Modern inverter-driven systems use only the power needed to match the load and operate much more efficiently.

Upgrading older units to high efficiency inverter systems can feel like a larger investment, but the savings, comfort improvements and future-proofing for environmental regulations make it a strong long term decision.

• Typical saving: around £4,500 per year
• Payback: roughly one year

Fix 5: Keep Filters and Coils Clean

Dirty filters and coils are one of the simplest issues to fix, but they are responsible for a lot of wasted energy. Restricted airflow forces fans to work harder and reduces cooling performance.

A quarterly maintenance schedule with filter changes and coil cleaning is usually enough to keep things running efficiently.

• Typical annual maintenance cost: around £500
• Typical annual saving: around £1,500

This is a classic low-hanging fruit recommendation that appears in many TM44 reports. ➡️ Annual AC Health Check

Fix 6: Optimise Temperature Setpoints

Raising the cooling setpoint even by 1°C can reduce AC energy use by 8-10%. Many offices run cooler than they need to, especially in open-plan spaces and near glass.

A combination of slightly higher setpoints, staff awareness and simple sensor-based automation can deliver noticeable savings with zero impact on comfort when it is done properly.

• Typical saving: around £1,200 per year
• Payback: often within three months

Fix 7: Improve Insulation and Air Sealing

Even the most efficient AC system cannot overcome a building that leaks cool air everywhere. Gaps, poor seals and weak insulation increase the load on your system and extend runtimes.

Targeting doors, windows, roof voids and exposed ductwork first often gives the best balance between cost and impact.

• Typical saving: around £2,250 per year
• Payback: around eight months

Fix 8: Add Variable Speed Drives to Fans and Pumps

Many HVAC systems run fans and pumps at full speed all day, even when the building is partly occupied or conditions are mild. That is wasted energy.

Variable Speed Drives let the motor speed match the actual demand. This reduces consumption while maintaining comfort and system performance.

• Typical saving: around £2,625 per year
• Payback: about one year

Fix 9: Install Heat Recovery Ventilation

Heat recovery systems capture energy from exhaust air and use it to pre-condition incoming fresh air. This lowers the cooling (and heating) load on your main plant, particularly in high occupancy spaces.

For the right building type, HRV can be a strong investment in both comfort and energy performance.

• Typical saving: around £3,750 per year
• Payback: about 1.2 years

Fix 10: Use Smart IoT Sensors and Predictive Controls

Smart building technology gives you live data on how your system runs: which zones are too cold, where airflows are weak, where plant is running when nobody is in the building and how setpoints drift over time.

With that visibility, it becomes much easier to tune operation and scheduling to match real use, rather than guesses.

• Typical saving: around £3,000 per year
• Payback: around one year

4. Stack These Fixes and Savings Multiply

The biggest impact does not come from just one recommendation. It comes from combining several of them in a planned way.

Most buildings that act on three to five of the highest impact TM44 fixes typically see:

• £10,000 to £20,000 per year in energy savings
• Better comfort for staff, tenants and visitors
• Less wear on equipment and fewer breakdowns
• A stronger position on MEES, EPC and wider ESG reporting

For multi site portfolios, those numbers scale quickly. A ten building portfolio saving £10,000 per site per year is putting more than £100,000 back into the business annually, while staying compliant and future ready.

You can see a real world example here:

➡️ How One Office Saved £48,300 After a TM44 Inspection

5. Ready To Get Ahead Of 2026?

If your AC systems total more than 12 kW, a TM44 inspection is not optional. The question is whether you treat it as a last minute cost or as a chance to upgrade performance and save serious money.

At TM44.uk, we offer:

• Nationwide coverage across England, Scotland and Wales
• Accredited and experienced TM44 assessors
• Government lodged certificates as standard
• Clear, practical opportunity reports and savings breakdowns
• Optional follow on works and same day fixes where possible
• Portfolio TM44 management for multi site operators

TM44.uk is your partner for TM44 compliance, energy efficiency and long term cost savings. We help you stay legal, cut waste and get more from the systems you already own.