A convenience store's cooling problem is often the heat the chilled and frozen cabinets reject into the aisle, plus lights, a door and a long shift at the till. The cabinets are doing their own job. Comfort air conditioning should make the aisle and the till livable without being aimed into open freezer decks as if those decks were a heat source to cancel. Survey cabinet heat, door openings and night stocking. An F-gas certified company installs the comfort system. Cabinet refrigeration is a different circuit.
Cabinet heat in the aisle before the shop is busy
Open decks and cabinet condensers dump heat into the sales floor all day and all night. That load stays when the shop is quiet. A survey that counts only people and floor area will miss why the aisle is hot at 7am. Ask someone who knows the cabinet plant where the heat comes out.
The till shift, the automatic door and a late condenser
Do not set the comfort unit to chase the air spilling from a freezer. You will overcool the aisle, ice up nothing useful and fight a refrigeration plant. Cool the occupied aisle and the till. Leave product temperatures to the cabinet contractor.
Automatic doors cycle all day. The first metre of floor will not hold a cold setpoint, and it does not need to. Staff at the till are there for a full shift. HSE workplace temperature guidance is about reasonable comfort, with no legal maximum. A mid 20s setpoint is a more honest target beside a door than 18C.
Evening and early hours matter if you trade them. The outdoor unit will be heard by neighbours at 10pm. Site it with that shift in mind, not only the midday photo. The ceiling is often a grid full of cabinet electrical supplies and fire detection. A cassette needs a void, a clear filter drop and a drain that is not across the cold aisle in a way that drips onto stock. A wall unit over the till can be simpler in a low soffit.
Cage trolleys, landlord consent and a separate circuit
Convenience stores are electrically busy. Landlord consent and coil clearances in a yard full of cage trolleys are the other limits. Keep the comfort refrigerant work with an F-gas certified company, separate from the cabinet gas work. Cabinet refrigeration stays excluded. A note of where cabinet heat enters the aisle will stop an undersized guess. Night stocking still needs a livable aisle.
Frequently asked questions
Why is the shop hot when the fridges are cold?
The cabinets reject their heat into the aisle. That heat is part of the comfort load. The cabinet circuit is not the air conditioning.
Should we aim the cassette into the freezer aisle?
Aim it for the people. Do not use comfort cooling to fight open freezer decks. Product temperature stays with the refrigeration contractor.
Does night trading change the outdoor unit position?
Yes. A condenser that is fine at noon can be a noise complaint at closing time. Include late hours and nearby windows in the survey.
Can the comfort unit share a cabinet isolator?
No. The comfort unit wants its own circuit, looked at by a competent electrician, not a spur from a cabinet isolator.
Core buying guides
Start with these high-intent guides, then dig into the rest of the library.
Related guides
Sources and further reading
How this guide was prepared
This guide was written by the Local AC Installers Editorial Team. We compare official guidance, legislation and established consumer information, separate general information from project-specific advice, and show publication dates and sources. We do not accept installer accreditation claims at face value.