One offer adds an indoor unit based on floor area.
THE READING FIELD GUIDE / AIR CONDITIONING
Air conditioning installers in Reading
A glazed extension can peak when older rooms stay cool. Give that Reading room its own load, unit position and outdoor route.

START WITH THE PROPERTY
Give the extension its own load
A Reading extension may have taller ceilings or more glass than the original house. Provide drawings if available and record when sun reaches the room before asking for equipment sizes.
BEFORE YOU ACCEPT A QUOTE
Check what the selected unit can deliver
The quote should show that room's cooling calculation, indoor position and external service route. Avoid a whole-house average that hides the extension's distinct peak demand.
ILLUSTRATIVE QUOTE COMPARISON
Is the extension's glass being counted?
Another models the glazing and roof exposure and marks an outdoor and drain route.
Ask for the room's design load and target comfort conditions. The extension may need a different answer from the original house.
ANOTHER PROJECT AT THE SAME ADDRESS?
Explore the other options in Reading.
NEXT STEP IN READING
Trace the outside services.
Once the extension load is known, ask where the outdoor unit, pipes and condensate will go. Those routes may determine disruption and cost more than the indoor model.