What to expect from LC Heating & Air
### Why Load Calculations Matter The most consequential decision in any HVAC installation is equipment sizing. Too large and the system short-cycles — it heats or cools the space quickly and shuts off before completing a full humidity-removal cycle, leaving the home feeling cold but clammy and wearing out equipment prematurely. Too small and the system runs continuously on extreme days without meeting the load. The only correct way to size HVAC equipment is with a Manual J load calculation.
Overview
### What Manual J Calculates Manual J is the ACCA standard for residential heating and cooling loads. It accounts for your home's square footage and geometry, insulation levels in walls, ceiling and floor, window area and glass type, solar orientation, ceiling heights, infiltration rate, internal heat gains from occupants and appliances, and local design temperatures. In Los Angeles, the design cooling temperature for the San Fernando Valley (where temperatures regularly exceed 100°F) is meaningfully higher than for coastal areas like Culver City or Brentwood — proper load calculations account for these local differences.
### California Code Requirement In California, a Manual J calculation is required for permit issuance on any new HVAC installation or replacement. Beyond the code requirement, it's simply the right way to select equipment. LC Heating & Air performs full Manual J calculations as part of every HVAC installation, using industry-standard software with accurate local climate data.
### Standalone Load Calculations If you're gathering bids and want an independent sizing recommendation before committing to a contractor, we offer standalone load calculation services. We measure your home, calculate the heating and cooling loads, and provide a written sizing recommendation you can use to evaluate proposals from any contractor.
Our Service Benefits
Load Calculation Cost in Los Angeles
Pricing ranges for common load calculation services. Your actual cost depends on equipment, complexity, and home configuration. We provide an exact written estimate before any work begins.
Service calls start at $125. Prices include parts and labor unless noted. Financing available on equipment installations. Learn about financing →
What Los Angeles Homeowners Say
“Had LC install a mini split in our 1940s bungalow. The work was clean, the unit is incredibly quiet. Highly recommend.”
“Furnace was making a loud noise. LC diagnosed it quickly, cleaned and tuned the whole system, tested CO levels, explained everything clearly.”
“We converted our garage into an ADU and needed HVAC. LC installed a mini split — permits, electrical, everything. Our tenant loves it.”
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(323) 970-3113 — Free diagnosisOur load calculation process
Home measurement
We measure your home's floor area, ceiling heights, window sizes and orientation, and assess insulation levels.
Data collection
We document wall construction, window glass type, infiltration characteristics, and any unusual heat gain sources.
Manual J calculation
We run the data through ACCA-approved software using local design temperatures for your specific neighborhood.
Written sizing report
You receive a written report with calculated heating and cooling loads and equipment sizing recommendations.
300+ verified reviews
Load Calculation — by city
Common questions about load calculation in Los Angeles
What customers say about load calculation
Verified reviews from Los Angeles homeowners who used our load calculation service.
“Got quotes from four companies. LC was the only one that actually did a Manual J calculation and explained why our old system was oversized. The new properly-sized Trane system cools better, runs quieter, and costs less to operate.”
“LC recommended a smaller furnace than the other companies who quoted us. They explained that our old one was oversized and that a properly sized unit would heat more evenly and last longer. They were right.”
“Had LC do a load calculation before choosing a new system. They recommended a smaller unit than the others — and they were right. Perfect comfort, lower bills, and the system doesn't short-cycle.”
