Is HVAC cleaning really needed?

🌬️ HVAC COMPARISON

Spore Type	Eurofins HVAC (5/6) Pre-cleaning	EMSL HVAC (5/19) Post-cleaning
Aspergillus/Penicillium	ND	ND
Cladosporium	400 spores/m³	ND
Myxomycetes	400 spores/m³	33 spores/m³
Basidiospores	ND	33 spores/m³
Ascospores	ND	33 spores/m³
Chaetomium	13 spores/m³	ND
Hyphal Fragments	53/m³	ND
Total Spores	840 spores/m³	100 spores/m³

I couldn't say what was stuck to the coin (visible with my borescope) in the supply ducting in this bedroom pre-cleaning. I took an air sample within 5 feet of the register in this room and one in the return ducting near the HVAC unit.

Even though I used two different labs you can see before and after results in the HVAC return ducting above was helpful. What changed in the bedroom was a small drop in Cladosporium and both Basidiospores and Myxomycetes showed up post cleaning where they were not found in the pre cleaning test.

Sometimes a different lab, different analyst, or even slight changes in where or how the air sample was taken can pick up new things.

These spores might have always been there — just below detection limits last time.

It is also possible that with cleaning, the spores were dispersed.

If you want to know more about testing in your home or office, call or text now. 303-501-5621.