Termite Prevention / Treatment in AZ

[DS MokNgo]

Hi All,

My property in Phoenix AZ was being treated twice for termites. In 2011, the company who did the treatment had to return 4 times to totally get rid of them, but in 2017, only 1 treatment was enough. 

It is about 4 years since the last treatment, I am considering to have another treatment just to prevent termites come back. I had 1 company went out for inspection and quote, tenant said there is some wood damage but the inspector doesn't think it is current active termites, it could be from old termite damage like back in 2017 or could be after that. 

I am thinking just to get a treatment done for piece of mind, but I am also open for opinions. 

Also the cheapest quote I got is $500 for 1 year warranty, or $800 for 5 years warranty. For both options the treatment will be using the same method but different product / chemical being used. Which option would you think it is better? Or is there other company you would recommend? Should I go with the 1 year warranty option and just get another treatment done say after another 4-5 yrs? but then I am unsure if the product they use for the 1 year warranty option is good enough to last for 4-5 years. 

After the treatment do you think it is ok to rely on the tenant to notify my property manager if they see more termite damage? Or when routine inspection (every 6-12 month) happen it should be obvious enough for the inspector to see if there is active termites, so my property manager can notify the company to come back during warranty period? Or should I get someone professional to go back take a look say yearly during the warranty period?

Thanks for help!