We aren't planning on selling in our lifetimes but it could impact our son. 

Seems like a silly question when they pay that much and are good tenants.If those are Low-E windows, they aren't letting in very much heat and adding blinds will have minimum impact.

But I don't see it having any significant impact in any area.  

Therefore, these other things would likely be impacted as well:-  Taxes would likely be lower-  Insurance would likely be lower -  If the property were smaller, capex would be lower, as would turnover costs-  If the property were in a worse location, the standard finishes would likely be cheaper-  If the property were in a worse condition, the standard of living/repairs would be lower-  Property management costs would scale downward by a linear amount to the rentAdd up all those savings, and you'd find that you'd likely save $300/month between a house that rents for $1800 and a house that rents for $1200...

We haven't noticed them impacting rents.  

They can also be a source of funding in case vacancies or delinquencies are high due to COVID-19, though not ideal.Factor #5: COVID-19’s Property-Specific ImpactThe fifth factor is COVID-19 and its impact directly on the property.

We can talk about the economy or recessions all day, but individually we have little impact on it.

It will be middle class and working class families that will be most impacted.... 

the tenants were on the upper level so not much impact to them.

The credit score impact may only be 20 or 30 points for having a high HELOC balance (say greater than 40% credit utilization).